51696972 has 18 divisors (see below), whose sum is σ = 130678548. Its totient is φ = 17232312.

The previous prime is 51696971. The next prime is 51696973. The reversal of 51696972 is 27969615.

It is a happy number.

51696972 is a `hidden beast` number, since 516 + 9 + 69 + 72 = 666.

It is an interprime number because it is at equal distance from previous prime (51696971) and next prime (51696973).

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (51696971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 717978 + ... + 718049.

Almost surely, 2^51696972 is an apocalyptic number.

It is an amenable number.

51696972 is an abundant number, since it is smaller than the sum of its proper divisors (78981576).

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

51696972 is a wasteful number, since it uses less digits than its factorization.

51696972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436037 (or 1436032 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 51696972 is about 7190.0606395218. The cubic root of 51696972 is about 372.5246672252.

The spelling of 51696972 in words is "fifty-one million, six hundred ninety-six thousand, nine hundred seventy-two".