55815582 has 16 divisors (see below), whose sum is σ = 112101120. Its totient is φ = 18526872.

The previous prime is 55815533. The next prime is 55815583. The reversal of 55815582 is 28551855.

It is a self number, because there is not a number n which added to its sum of digits gives 55815582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55815583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18028 + ... + 20895.

It is an arithmetic number, because the mean of its divisors is an integer number (7006320).

Almost surely, 2^55815582 is an apocalyptic number.

55815582 is an abundant number, since it is smaller than the sum of its proper divisors (56285538).

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

55815582 is a wasteful number, since it uses less digits than its factorization.

55815582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39167.

The product of its digits is 80000, while the sum is 39.

The square root of 55815582 is about 7470.9826662896. The cubic root of 55815582 is about 382.1657997597.

The spelling of 55815582 in words is "fifty-five million, eight hundred fifteen thousand, five hundred eighty-two".