651978080 has 96 divisors (see below), whose sum is σ = 1664820864. Its totient is φ = 239855616.

The previous prime is 651978077. The next prime is 651978097. The reversal of 651978080 is 80879156.

It is a happy number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 962702 + ... + 963378.

It is an arithmetic number, because the mean of its divisors is an integer number (17341884).

Almost surely, 2^651978080 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651978080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (832410432).

651978080 is an abundant number, since it is smaller than the sum of its proper divisors (1012842784).

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

651978080 is a wasteful number, since it uses less digits than its factorization.

651978080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168 (or 1160 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 651978080 is about 25533.8614392731. The cubic root of 651978080 is about 867.1169284269.

The spelling of 651978080 in words is "six hundred fifty-one million, nine hundred seventy-eight thousand, eighty".