651464990 has 128 divisors (see below), whose sum is σ = 1440270720. Its totient is φ = 209305600.

The previous prime is 651464981. The next prime is 651464993. The reversal of 651464990 is 99464156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651464993) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2223284 + ... + 2223576.

It is an arithmetic number, because the mean of its divisors is an integer number (11252115).

Almost surely, 2^651464990 is an apocalyptic number.

651464990 is an abundant number, since it is smaller than the sum of its proper divisors (788805730).

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

651464990 is a wasteful number, since it uses less digits than its factorization.

651464990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 651464990 is about 25523.8122152628. The cubic root of 651464990 is about 866.8894024818.

The spelling of 651464990 in words is "six hundred fifty-one million, four hundred sixty-four thousand, nine hundred ninety".