51891786 has 32 divisors (see below), whose sum is σ = 122100480. Its totient is φ = 16279488.

The previous prime is 51891767. The next prime is 51891787. The reversal of 51891786 is 68719815.

It is not an unprimeable number, because it can be changed into a prime (51891787) 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, 27346 + ... + 29181.

It is an arithmetic number, because the mean of its divisors is an integer number (3815640).

Almost surely, 2^51891786 is an apocalyptic number.

51891786 is an abundant number, since it is smaller than the sum of its proper divisors (70208694).

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

51891786 is a wasteful number, since it uses less digits than its factorization.

51891786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56555 (or 56549 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 51891786 is about 7203.5953523223. The cubic root of 51891786 is about 372.9920192261.

The spelling of 51891786 in words is "fifty-one million, eight hundred ninety-one thousand, seven hundred eighty-six".