55815102 has 64 divisors (see below), whose sum is σ = 142848000. Its totient is φ = 15824160.

The previous prime is 55815101. The next prime is 55815127. The reversal of 55815102 is 20151855.

55815102 is a `hidden beast` number, since 558 + 1 + 5 + 102 = 666.

It is a super-2 number, since 2×55815102² = 6230651222540808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55815101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55827 + ... + 56817.

It is an arithmetic number, because the mean of its divisors is an integer number (2232000).

Almost surely, 2^55815102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55815102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71424000).

55815102 is an abundant number, since it is smaller than the sum of its proper divisors (87032898).

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

55815102 is a wasteful number, since it uses less digits than its factorization.

55815102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 55815102 is about 7470.9505419324. The cubic root of 55815102 is about 382.1647042466.

Adding to 55815102 its reverse (20151855), we get a palindrome (75966957).

The spelling of 55815102 in words is "fifty-five million, eight hundred fifteen thousand, one hundred two".