721089896 has 8 divisors (see below), whose sum is σ = 1352043570. Its totient is φ = 360544944.

The previous prime is 721089877. The next prime is 721089907. The reversal of 721089896 is 698980127.

It can be written as a sum of positive squares in only one way, i.e., 719848900 + 1240996 = 26830^2 + 1114^2 .

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

It is a super-2 number, since 2×721089896² = 1039941276226581632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45068111 + ... + 45068126.

Almost surely, 2^721089896 is an apocalyptic number.

It is an amenable number.

721089896 is a deficient number, since it is larger than the sum of its proper divisors (630953674).

721089896 is a wasteful number, since it uses less digits than its factorization.

721089896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90136243 (or 90136239 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 721089896 is about 26853.1170630152. The cubic root of 721089896 is about 896.7329680770.

The spelling of 721089896 in words is "seven hundred twenty-one million, eighty-nine thousand, eight hundred ninety-six".