55451340 has 108 divisors (see below), whose sum is σ = 195695136. Its totient is φ = 12672576.

The previous prime is 55451339. The next prime is 55451353. The reversal of 55451340 is 4315455.

It is a super-2 number, since 2×55451340² = 6149702215591200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5677 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (1811992).

Almost surely, 2^55451340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55451340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97847568).

55451340 is an abundant number, since it is smaller than the sum of its proper divisors (140243796).

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

55451340 is a wasteful number, since it uses less digits than its factorization.

55451340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6316 (or 6304 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 55451340 is about 7446.5656513590. The cubic root of 55451340 is about 381.3326707760.

Adding to 55451340 its reverse (4315455), we get a palindrome (59766795).

The spelling of 55451340 in words is "fifty-five million, four hundred fifty-one thousand, three hundred forty".