55381536 has 96 divisors (see below), whose sum is σ = 184625280. Its totient is φ = 15821568.

The previous prime is 55381519. The next prime is 55381553. The reversal of 55381536 is 63518355.

It is an interprime number because it is at equal distance from previous prime (55381519) and next prime (55381553).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×55381536² = 6134229059438592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 55381536.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1470 + ... + 10626.

It is an arithmetic number, because the mean of its divisors is an integer number (1923180).

Almost surely, 2^55381536 is an apocalyptic number.

55381536 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55381536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92312640).

55381536 is an abundant number, since it is smaller than the sum of its proper divisors (129243744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55381536 is a wasteful number, since it uses less digits than its factorization.

55381536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9183 (or 9169 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 55381536 is about 7441.8771825394. The cubic root of 55381536 is about 381.1725921497.

The spelling of 55381536 in words is "fifty-five million, three hundred eighty-one thousand, five hundred thirty-six".