51642012 has 12 divisors (see below), whose sum is σ = 120498056. Its totient is φ = 17214000.

The previous prime is 51641999. The next prime is 51642029. The reversal of 51642012 is 21024615.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51642012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151739 + ... + 2151762.

Almost surely, 2^51642012 is an apocalyptic number.

It is an amenable number.

51642012 is an abundant number, since it is smaller than the sum of its proper divisors (68856044).

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

51642012 is a wasteful number, since it uses less digits than its factorization.

51642012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303508 (or 4303506 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 51642012 is about 7186.2376804556. The cubic root of 51642012 is about 372.3926078117.

Adding to 51642012 its reverse (21024615), we get a palindrome (72666627).

The spelling of 51642012 in words is "fifty-one million, six hundred forty-two thousand, twelve".