721370088 has 24 divisors (see below), whose sum is σ = 1953710850. Its totient is φ = 240456672.

The previous prime is 721370063. The next prime is 721370123. The reversal of 721370088 is 880073127.

It can be written as a sum of positive squares in only one way, i.e., 713851524 + 7518564 = 26718^2 + 2742^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×721370088² = 1040749607722255488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5009443 + ... + 5009586.

Almost surely, 2^721370088 is an apocalyptic number.

It is an amenable number.

721370088 is an abundant number, since it is smaller than the sum of its proper divisors (1232340762).

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

721370088 is a wasteful number, since it uses less digits than its factorization.

721370088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10019041 (or 10019034 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 721370088 is about 26858.3336787672. Note that the first 3 decimals coincide. The cubic root of 721370088 is about 896.8491000918.

The spelling of 721370088 in words is "seven hundred twenty-one million, three hundred seventy thousand, eighty-eight".