51691752 has 48 divisors (see below), whose sum is σ = 159999840. Its totient is φ = 14768928.

The previous prime is 51691721. The next prime is 51691753. The reversal of 51691752 is 25719615.

51691752 is a `hidden beast` number, since 516 + 91 + 7 + 52 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51691753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50778 + ... + 51785.

It is an arithmetic number, because the mean of its divisors is an integer number (3333330).

Almost surely, 2^51691752 is an apocalyptic number.

It is an amenable number.

51691752 is an abundant number, since it is smaller than the sum of its proper divisors (108308088).

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

51691752 is a wasteful number, since it uses less digits than its factorization.

51691752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102582 (or 102575 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 51691752 is about 7189.6976292470. The cubic root of 51691752 is about 372.5121284882.

The spelling of 51691752 in words is "fifty-one million, six hundred ninety-one thousand, seven hundred fifty-two".