651997920 has 288 divisors, whose sum is σ = 2516572800. Its totient is φ = 141087744.

The previous prime is 651997877. The next prime is 651997937. The reversal of 651997920 is 29799156.

651997920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 651997920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 446151 + ... + 447609.

It is an arithmetic number, because the mean of its divisors is an integer number (8738100).

Almost surely, 2^651997920 is an apocalyptic number.

651997920 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 651997920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1258286400).

651997920 is an abundant number, since it is smaller than the sum of its proper divisors (1864574880).

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

651997920 is a wasteful number, since it uses less digits than its factorization.

651997920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1495 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 48.

The square root of 651997920 is about 25534.2499400315. The cubic root of 651997920 is about 867.1257239298.

The spelling of 651997920 in words is "six hundred fifty-one million, nine hundred ninety-seven thousand, nine hundred twenty".