51537780 has 72 divisors (see below), whose sum is σ = 178668672. Its totient is φ = 11779776.

The previous prime is 51537769. The next prime is 51537797. The reversal of 51537780 is 8773515.

51537780 is a `hidden beast` number, since 51 + 537 + 78 + 0 = 666.

51537780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51537780² = 5312285534656800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19192 + ... + 21711.

Almost surely, 2^51537780 is an apocalyptic number.

It is an amenable number.

51537780 is an abundant number, since it is smaller than the sum of its proper divisors (127130892).

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

51537780 is a wasteful number, since it uses less digits than its factorization.

51537780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40925 (or 40920 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 51537780 is about 7178.9818219578. The cubic root of 51537780 is about 372.1418986930.

The spelling of 51537780 in words is "fifty-one million, five hundred thirty-seven thousand, seven hundred eighty".