721894152 has 32 divisors (see below), whose sum is σ = 2062555200. Its totient is φ = 206255424.

The previous prime is 721894127. The next prime is 721894163. The reversal of 721894152 is 251498127.

It is a super-2 number, since 2×721894152² = 1042262333383598208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 721894152.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2148327 + ... + 2148662.

It is an arithmetic number, because the mean of its divisors is an integer number (64454850).

Almost surely, 2^721894152 is an apocalyptic number.

It is an amenable number.

721894152 is an abundant number, since it is smaller than the sum of its proper divisors (1340661048).

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

721894152 is a wasteful number, since it uses less digits than its factorization.

721894152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4297005 (or 4297001 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 721894152 is about 26868.0879855638. The cubic root of 721894152 is about 897.0662297654.

The spelling of 721894152 in words is "seven hundred twenty-one million, eight hundred ninety-four thousand, one hundred fifty-two".