51375636 has 72 divisors (see below), whose sum is σ = 140975744. Its totient is φ = 15681600.

The previous prime is 51375613. The next prime is 51375641. The reversal of 51375636 is 63657315.

It is a happy number.

51375636 is a `hidden beast` number, since 5 + 13 + 7 + 5 + 636 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51375636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70305 + ... + 71031.

Almost surely, 2^51375636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51375636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70487872).

51375636 is an abundant number, since it is smaller than the sum of its proper divisors (89600108).

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

51375636 is a wasteful number, since it uses less digits than its factorization.

51375636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 896 counting only the distinct ones).

The product of its digits is 56700, while the sum is 36.

The square root of 51375636 is about 7167.6799593732. The cubic root of 51375636 is about 371.7512211072.

The spelling of 51375636 in words is "fifty-one million, three hundred seventy-five thousand, six hundred thirty-six".