51643692 has 36 divisors (see below), whose sum is σ = 130768456. Its totient is φ = 17184960.

The previous prime is 51643687. The next prime is 51643699. The reversal of 51643692 is 29634615.

It is a happy number.

51643692 is a `hidden beast` number, since 5 + 1 + 643 + 6 + 9 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 (51643699) 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, 32967 + ... + 34497.

Almost surely, 2^51643692 is an apocalyptic number.

It is an amenable number.

51643692 is an abundant number, since it is smaller than the sum of its proper divisors (79124764).

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

51643692 is a wasteful number, since it uses less digits than its factorization.

51643692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478 (or 2473 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 51643692 is about 7186.3545695992. The cubic root of 51643692 is about 372.3966459502.

The spelling of 51643692 in words is "fifty-one million, six hundred forty-three thousand, six hundred ninety-two".