720779944 has 8 divisors (see below), whose sum is σ = 1351462410. Its totient is φ = 360389968.

The previous prime is 720779933. The next prime is 720779951. The reversal of 720779944 is 449977027.

It can be written as a sum of positive squares in only one way, i.e., 708092100 + 12687844 = 26610^2 + 3562^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45048739 + ... + 45048754.

Almost surely, 2^720779944 is an apocalyptic number.

It is an amenable number.

720779944 is a deficient number, since it is larger than the sum of its proper divisors (630682466).

720779944 is a wasteful number, since it uses less digits than its factorization.

720779944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90097499 (or 90097495 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 49.

The square root of 720779944 is about 26847.3451946370. The cubic root of 720779944 is about 896.6044662949.

The spelling of 720779944 in words is "seven hundred twenty million, seven hundred seventy-nine thousand, nine hundred forty-four".