51187690 has 16 divisors (see below), whose sum is σ = 92492928. Its totient is φ = 20396176.

The previous prime is 51187681. The next prime is 51187699. The reversal of 51187690 is 9678115.

It is an interprime number because it is at equal distance from previous prime (51187681) and next prime (51187699).

It is a super-2 number, since 2×51187690² = 5240359215072200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51187699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7102 + ... + 12361.

It is an arithmetic number, because the mean of its divisors is an integer number (5780808).

Almost surely, 2^51187690 is an apocalyptic number.

51187690 is a deficient number, since it is larger than the sum of its proper divisors (41305238).

51187690 is a wasteful number, since it uses less digits than its factorization.

51187690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19733.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 51187690 is about 7154.5572888894. The cubic root of 51187690 is about 371.2973449503.

The spelling of 51187690 in words is "fifty-one million, one hundred eighty-seven thousand, six hundred ninety".