970721920 has 64 divisors (see below), whose sum is σ = 2652163200. Its totient is φ = 332817408.

The previous prime is 970721911. The next prime is 970721987. The reversal of 970721920 is 29127079.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 970721920.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103860 + ... + 112819.

It is an arithmetic number, because the mean of its divisors is an integer number (41440050).

Almost surely, 2^970721920 is an apocalyptic number.

It is an amenable number.

970721920 is an abundant number, since it is smaller than the sum of its proper divisors (1681441280).

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

970721920 is a wasteful number, since it uses less digits than its factorization.

970721920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216705 (or 216693 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 970721920 is about 31156.4105763164. The cubic root of 970721920 is about 990.1438147704.

Adding to 970721920 its reverse (29127079), we get a palindrome (999848999).

The spelling of 970721920 in words is "nine hundred seventy million, seven hundred twenty-one thousand, nine hundred twenty".