51029599720 has 256 divisors, whose sum is σ = 137641420800. Its totient is φ = 16827494400.

The previous prime is 51029599717. The next prime is 51029599757. The reversal of 51029599720 is 2799592015.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 222836566 + ... + 222836794.

It is an arithmetic number, because the mean of its divisors is an integer number (537661800).

Almost surely, 2^51029599720 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 51029599720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68820710400).

51029599720 is an abundant number, since it is smaller than the sum of its proper divisors (86611821080).

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

51029599720 is a wasteful number, since it uses less digits than its factorization.

51029599720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 510300, while the sum is 49.

The spelling of 51029599720 in words is "fifty-one billion, twenty-nine million, five hundred ninety-nine thousand, seven hundred twenty".