720739970 has 16 divisors (see below), whose sum is σ = 1298534328. Its totient is φ = 288028800.

The previous prime is 720739963. The next prime is 720739993. The reversal of 720739970 is 79937027.

It can be written as a sum of positive squares in 4 ways, for example, as 664144441 + 56595529 = 25771^2 + 7523^2 .

It is a super-2 number, since 2×720739970² = 1038932208711201800, which contains 22 as substring.

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, 21881 + ... + 43820.

Almost surely, 2^720739970 is an apocalyptic number.

720739970 is a deficient number, since it is larger than the sum of its proper divisors (577794358).

720739970 is a wasteful number, since it uses less digits than its factorization.

720739970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66805.

The product of its (nonzero) digits is 166698, while the sum is 44.

The square root of 720739970 is about 26846.6007159193. The cubic root of 720739970 is about 896.5878909495.

The spelling of 720739970 in words is "seven hundred twenty million, seven hundred thirty-nine thousand, nine hundred seventy".