51435720 has 96 divisors (see below), whose sum is σ = 191056320. Its totient is φ = 11756160.

The previous prime is 51435677. The next prime is 51435721. The reversal of 51435720 is 2753415.

It is a happy number.

51435720 is a `hidden beast` number, since 51 + 43 + 572 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (51435721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7686 + ... + 12725.

It is an arithmetic number, because the mean of its divisors is an integer number (1990170).

Almost surely, 2^51435720 is an apocalyptic number.

It is an amenable number.

51435720 is an abundant number, since it is smaller than the sum of its proper divisors (139620600).

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

51435720 is a wasteful number, since it uses less digits than its factorization.

51435720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20435 (or 20428 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 51435720 is about 7171.8700490179. The cubic root of 51435720 is about 371.8960861334.

The spelling of 51435720 in words is "fifty-one million, four hundred thirty-five thousand, seven hundred twenty".