51614640 has 480 divisors, whose sum is σ = 232128000. Its totient is φ = 10160640.

The previous prime is 51614627. The next prime is 51614677. The reversal of 51614640 is 4641615.

51614640 is a `hidden beast` number, since 5 + 1 + 6 + 14 + 640 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2716551 + ... + 2716569.

It is an arithmetic number, because the mean of its divisors is an integer number (483600).

Almost surely, 2^51614640 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 51614640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116064000).

51614640 is an abundant number, since it is smaller than the sum of its proper divisors (180513360).

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

51614640 is a wasteful number, since it uses less digits than its factorization.

51614640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51614640 is about 7184.3329544224. The cubic root of 51614640 is about 372.3268026562.

It can be divided in two parts, 5161 and 4640, that added together give a square (9801 = 99²).

The spelling of 51614640 in words is "fifty-one million, six hundred fourteen thousand, six hundred forty".