651671620 has 12 divisors (see below), whose sum is σ = 1368510444. Its totient is φ = 260668640.

The previous prime is 651671597. The next prime is 651671653. The reversal of 651671620 is 26176156.

It is a happy number.

651671620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 200279104 + 451392516 = 14152^2 + 21246^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16291771 + ... + 16291810.

It is an arithmetic number, because the mean of its divisors is an integer number (114042537).

Almost surely, 2^651671620 is an apocalyptic number.

It is an amenable number.

651671620 is an abundant number, since it is smaller than the sum of its proper divisors (716838824).

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

651671620 is a wasteful number, since it uses less digits than its factorization.

651671620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32583590 (or 32583588 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 651671620 is about 25527.8596830992. The cubic root of 651671620 is about 866.9810453816.

The spelling of 651671620 in words is "six hundred fifty-one million, six hundred seventy-one thousand, six hundred twenty".