55615428 has 36 divisors (see below), whose sum is σ = 153364848. Its totient is φ = 16853040.

The previous prime is 55615423. The next prime is 55615453. The reversal of 55615428 is 82451655.

55615428 is a `hidden beast` number, since 55 + 61 + 542 + 8 = 666.

55615428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 55615392 and 55615401.

It is not an unprimeable number, because it can be changed into a prime (55615423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69826 + ... + 70617.

Almost surely, 2^55615428 is an apocalyptic number.

It is an amenable number.

55615428 is an abundant number, since it is smaller than the sum of its proper divisors (97749420).

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

55615428 is a wasteful number, since it uses less digits than its factorization.

55615428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140464 (or 140459 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 55615428 is about 7457.5752091414. The cubic root of 55615428 is about 381.7084386521.

The spelling of 55615428 in words is "fifty-five million, six hundred fifteen thousand, four hundred twenty-eight".