720705402 has 12 divisors (see below), whose sum is σ = 1561528410. Its totient is φ = 240235128.

The previous prime is 720705347. The next prime is 720705407. The reversal of 720705402 is 204507027.

It can be written as a sum of positive squares in only one way, i.e., 433097721 + 287607681 = 20811^2 + 16959^2 .

It is not an unprimeable number, because it can be changed into a prime (720705407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20019577 + ... + 20019612.

Almost surely, 2^720705402 is an apocalyptic number.

720705402 is an abundant number, since it is smaller than the sum of its proper divisors (840823008).

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

720705402 is a wasteful number, since it uses less digits than its factorization.

720705402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40039197 (or 40039194 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 720705402 is about 26845.9569022972. The cubic root of 720705402 is about 896.5735567250.

The spelling of 720705402 in words is "seven hundred twenty million, seven hundred five thousand, four hundred two".