51428187 has 12 divisors (see below), whose sum is σ = 76293360. Its totient is φ = 33358608.

The previous prime is 51428173. The next prime is 51428189. The reversal of 51428187 is 78182415.

51428187 is a `hidden beast` number, since 51 + 428 + 187 = 666.

It is not a de Polignac number, because 51428187 - 2⁶ = 51428123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51428189) 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, 76887 + ... + 77552.

It is an arithmetic number, because the mean of its divisors is an integer number (6357780).

Almost surely, 2^51428187 is an apocalyptic number.

51428187 is a deficient number, since it is larger than the sum of its proper divisors (24865173).

51428187 is a wasteful number, since it uses less digits than its factorization.

51428187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154482 (or 154479 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 51428187 is about 7171.3448529547. The cubic root of 51428187 is about 371.8779299442.

It can be divided in two parts, 51428 and 187, that added together give a palindrome (51615).

The spelling of 51428187 in words is "fifty-one million, four hundred twenty-eight thousand, one hundred eighty-seven".