721457475 has 24 divisors (see below), whose sum is σ = 1262977200. Its totient is φ = 362142720.

The previous prime is 721457459. The next prime is 721457501. The reversal of 721457475 is 574754127.

It is not a de Polignac number, because 721457475 - 2⁴ = 721457459 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281650 + ... + 284199.

It is an arithmetic number, because the mean of its divisors is an integer number (52624050).

Almost surely, 2^721457475 is an apocalyptic number.

721457475 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

721457475 is a deficient number, since it is larger than the sum of its proper divisors (541519725).

721457475 is a wasteful number, since it uses less digits than its factorization.

721457475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565879 (or 565874 counting only the distinct ones).

The product of its digits is 274400, while the sum is 42.

The square root of 721457475 is about 26859.9604430088. The cubic root of 721457475 is about 896.8853134905.

The spelling of 721457475 in words is "seven hundred twenty-one million, four hundred fifty-seven thousand, four hundred seventy-five".