51490686 has 16 divisors (see below), whose sum is σ = 110903184. Its totient is φ = 15843264.

The previous prime is 51490667. The next prime is 51490697. The reversal of 51490686 is 68609415.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329991 + ... + 330146.

It is an arithmetic number, because the mean of its divisors is an integer number (6931449).

Almost surely, 2^51490686 is an apocalyptic number.

51490686 is an abundant number, since it is smaller than the sum of its proper divisors (59412498).

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

51490686 is a wasteful number, since it uses less digits than its factorization.

51490686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660155.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 51490686 is about 7175.7010807307. The cubic root of 51490686 is about 372.0285126717.

The spelling of 51490686 in words is "fifty-one million, four hundred ninety thousand, six hundred eighty-six".