651319920 has 320 divisors, whose sum is σ = 2365562880. Its totient is φ = 164505600.

The previous prime is 651319919. The next prime is 651319969. The reversal of 651319920 is 29913156.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4754092 + ... + 4754228.

It is an arithmetic number, because the mean of its divisors is an integer number (7392384).

Almost surely, 2^651319920 is an apocalyptic number.

651319920 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 651319920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1182781440).

651319920 is an abundant number, since it is smaller than the sum of its proper divisors (1714242960).

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

651319920 is a wasteful number, since it uses less digits than its factorization.

651319920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 651319920 is about 25520.9702009935. The cubic root of 651319920 is about 866.8250506064.

The spelling of 651319920 in words is "six hundred fifty-one million, three hundred nineteen thousand, nine hundred twenty".