51787272 has 64 divisors (see below), whose sum is σ = 137620800. Its totient is φ = 16208640.

The previous prime is 51787271. The next prime is 51787273. The reversal of 51787272 is 27278715.

It is an interprime number because it is at equal distance from previous prime (51787271) and next prime (51787273).

It is a self number, because there is not a number n which added to its sum of digits gives 51787272.

It is not an unprimeable number, because it can be changed into a prime (51787271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24747 + ... + 26757.

It is an arithmetic number, because the mean of its divisors is an integer number (2150325).

Almost surely, 2^51787272 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 51787272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68810400).

51787272 is an abundant number, since it is smaller than the sum of its proper divisors (85833528).

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

51787272 is a wasteful number, since it uses less digits than its factorization.

51787272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086 (or 2082 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 51787272 is about 7196.3374017621. The cubic root of 51787272 is about 372.7414394990.

The spelling of 51787272 in words is "fifty-one million, seven hundred eighty-seven thousand, two hundred seventy-two".