53711640 has 128 divisors (see below), whose sum is σ = 183556800. Its totient is φ = 13962240.

The previous prime is 53711639. The next prime is 53711657. The reversal of 53711640 is 4611735.

53711640 is a `hidden beast` number, since 5 + 3 + 7 + 11 + 640 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43674 + ... + 44886.

Almost surely, 2^53711640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53711640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91778400).

53711640 is an abundant number, since it is smaller than the sum of its proper divisors (129845160).

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

53711640 is a wasteful number, since it uses less digits than its factorization.

53711640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274 (or 1264 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 53711640 is about 7328.8225520884. The cubic root of 53711640 is about 377.3023159821.

The spelling of 53711640 in words is "fifty-three million, seven hundred eleven thousand, six hundred forty".