55156644 has 36 divisors (see below), whose sum is σ = 142828140. Its totient is φ = 17936640.

The previous prime is 55156643. The next prime is 55156667. The reversal of 55156644 is 44665155.

55156644 is a `hidden beast` number, since 5 + 5 + 1 + 5 + 6 + 644 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20793600 + 34363044 = 4560^2 + 5862^2 .

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 = 55156599 and 55156608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55156643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17209 + ... + 20160.

Almost surely, 2^55156644 is an apocalyptic number.

It is an amenable number.

55156644 is an abundant number, since it is smaller than the sum of its proper divisors (87671496).

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

55156644 is a wasteful number, since it uses less digits than its factorization.

55156644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37420 (or 37415 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 55156644 is about 7426.7519145317. The cubic root of 55156644 is about 380.6559400379.

The spelling of 55156644 in words is "fifty-five million, one hundred fifty-six thousand, six hundred forty-four".