720505108 has 24 divisors (see below), whose sum is σ = 1286568360. Its totient is φ = 352934400.

The previous prime is 720505103. The next prime is 720505111. The reversal of 720505108 is 801505027.

It can be written as a sum of positive squares in 4 ways, for example, as 136702864 + 583802244 = 11692^2 + 24162^2 .

It is a super-2 number, since 2×720505108² = 1038255221308183328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720505103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169408 + ... + 173608.

It is an arithmetic number, because the mean of its divisors is an integer number (53607015).

Almost surely, 2^720505108 is an apocalyptic number.

It is an amenable number.

720505108 is a deficient number, since it is larger than the sum of its proper divisors (566063252).

720505108 is a wasteful number, since it uses less digits than its factorization.

720505108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5067 (or 5065 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 720505108 is about 26842.2262116986. The cubic root of 720505108 is about 896.4904922987.

The spelling of 720505108 in words is "seven hundred twenty million, five hundred five thousand, one hundred eight".