51564040 has 32 divisors (see below), whose sum is σ = 126567360. Its totient is φ = 18750400.

The previous prime is 51564031. The next prime is 51564041. The reversal of 51564040 is 4046515.

It is a super-2 number, since 2×51564040² = 5317700442243200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51563996 and 51564014.

It is not an unprimeable number, because it can be changed into a prime (51564041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58156 + ... + 59035.

It is an arithmetic number, because the mean of its divisors is an integer number (3955230).

Almost surely, 2^51564040 is an apocalyptic number.

It is an amenable number.

51564040 is an abundant number, since it is smaller than the sum of its proper divisors (75003320).

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

51564040 is a wasteful number, since it uses less digits than its factorization.

51564040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117213 (or 117209 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 51564040 is about 7180.8105392080. The cubic root of 51564040 is about 372.2050936732.

The spelling of 51564040 in words is "fifty-one million, five hundred sixty-four thousand, forty".