651361920 has 128 divisors (see below), whose sum is σ = 2265036480. Its totient is φ = 157900800.

The previous prime is 651361903. The next prime is 651361937. The reversal of 651361920 is 29163156.

It is a happy number.

651361920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (651361903) and next prime (651361937).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 5700 + ... + 36540.

Almost surely, 2^651361920 is an apocalyptic number.

651361920 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 651361920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1132518240).

651361920 is an abundant number, since it is smaller than the sum of its proper divisors (1613674560).

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

651361920 is a wasteful number, since it uses less digits than its factorization.

651361920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30874 (or 30862 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 651361920 is about 25521.7930404586. The cubic root of 651361920 is about 866.8436824484.

The spelling of 651361920 in words is "six hundred fifty-one million, three hundred sixty-one thousand, nine hundred twenty".