55745640 has 48 divisors (see below), whose sum is σ = 181174500. Its totient is φ = 14865408.

The previous prime is 55745611. The next prime is 55745653. The reversal of 55745640 is 4654755.

It is a happy number.

55745640 is a `hidden beast` number, since 5 + 5 + 7 + 4 + 5 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51753636 + 3992004 = 7194^2 + 1998^2 .

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 = 55745595 and 55745604.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77065 + ... + 77784.

Almost surely, 2^55745640 is an apocalyptic number.

It is an amenable number.

55745640 is an abundant number, since it is smaller than the sum of its proper divisors (125428860).

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

55745640 is a wasteful number, since it uses less digits than its factorization.

55745640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154866 (or 154859 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 36.

The square root of 55745640 is about 7466.3002886302. The cubic root of 55745640 is about 382.0061035363.

The spelling of 55745640 in words is "fifty-five million, seven hundred forty-five thousand, six hundred forty".