51247872 has 216 divisors, whose sum is σ = 167403600. Its totient is φ = 14966784.

The previous prime is 51247837. The next prime is 51247919. The reversal of 51247872 is 27874215.

51247872 is a `hidden beast` number, since 512 + 4 + 78 + 72 = 666.

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

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, 868579 + ... + 868637.

Almost surely, 2^51247872 is an apocalyptic number.

51247872 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51247872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83701800).

51247872 is an abundant number, since it is smaller than the sum of its proper divisors (116155728).

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

51247872 is a wasteful number, since it uses less digits than its factorization.

51247872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 106 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 51247872 is about 7158.7619041284. The cubic root of 51247872 is about 371.4428009201.

It can be divided in two parts, 5124 and 7872, that added together give a square (12996 = 114²).

The spelling of 51247872 in words is "fifty-one million, two hundred forty-seven thousand, eight hundred seventy-two".