721162120 has 64 divisors (see below), whose sum is σ = 1899676800. Its totient is φ = 241221120.

The previous prime is 721162103. The next prime is 721162121. The reversal of 721162120 is 21261127.

It is a happy number.

721162120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 721162091 and 721162100.

It is not an unprimeable number, because it can be changed into a prime (721162121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19930 + ... + 42889.

It is an arithmetic number, because the mean of its divisors is an integer number (29682450).

Almost surely, 2^721162120 is an apocalyptic number.

721162120 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

721162120 is an abundant number, since it is smaller than the sum of its proper divisors (1178514680).

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

721162120 is a wasteful number, since it uses less digits than its factorization.

721162120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62878 (or 62874 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 721162120 is about 26854.4618266686. The cubic root of 721162120 is about 896.7629058513.

The spelling of 721162120 in words is "seven hundred twenty-one million, one hundred sixty-two thousand, one hundred twenty".