721494460 has 12 divisors (see below), whose sum is σ = 1515138408. Its totient is φ = 288597776.

The previous prime is 721494457. The next prime is 721494469. The reversal of 721494460 is 64494127.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721494469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18037342 + ... + 18037381.

It is an arithmetic number, because the mean of its divisors is an integer number (126261534).

Almost surely, 2^721494460 is an apocalyptic number.

It is an amenable number.

721494460 is an abundant number, since it is smaller than the sum of its proper divisors (793643948).

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

721494460 is a wasteful number, since it uses less digits than its factorization.

721494460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36074732 (or 36074730 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 721494460 is about 26860.6489124891. The cubic root of 721494460 is about 896.9006392894.

The spelling of 721494460 in words is "seven hundred twenty-one million, four hundred ninety-four thousand, four hundred sixty".