651691920 has 160 divisors (see below), whose sum is σ = 2275282944. Its totient is φ = 152870400.

The previous prime is 651691919. The next prime is 651691927. The reversal of 651691920 is 29196156.

It is not an unprimeable number, because it can be changed into a prime (651691927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77859 + ... + 85821.

Almost surely, 2^651691920 is an apocalyptic number.

651691920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651691920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1137641472).

651691920 is an abundant number, since it is smaller than the sum of its proper divisors (1623591024).

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

651691920 is a wasteful number, since it uses less digits than its factorization.

651691920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8021 (or 8015 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 651691920 is about 25528.2572848207. The cubic root of 651691920 is about 866.9900476316.

The spelling of 651691920 in words is "six hundred fifty-one million, six hundred ninety-one thousand, nine hundred twenty".