51900012 has 36 divisors (see below), whose sum is σ = 131411280. Its totient is φ = 17271072.

The previous prime is 51899987. The next prime is 51900019. The reversal of 51900012 is 21000915.

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

It is a super-2 number, since 2×51900012² = 5387222491200288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51900019) 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, 38689 + ... + 40007.

Almost surely, 2^51900012 is an apocalyptic number.

It is an amenable number.

51900012 is an abundant number, since it is smaller than the sum of its proper divisors (79511268).

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

51900012 is a wasteful number, since it uses less digits than its factorization.

51900012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422 (or 2417 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 51900012 is about 7204.1662945826. The cubic root of 51900012 is about 373.0117273564.

Adding to 51900012 its reverse (21000915), we get a palindrome (72900927).

The spelling of 51900012 in words is "fifty-one million, nine hundred thousand, twelve".