721253260 has 48 divisors (see below), whose sum is σ = 1864166976. Its totient is φ = 228264192.

The previous prime is 721253227. The next prime is 721253279. The reversal of 721253260 is 62352127.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196327 + ... + 199966.

It is an arithmetic number, because the mean of its divisors is an integer number (38836812).

Almost surely, 2^721253260 is an apocalyptic number.

721253260 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

721253260 is an abundant number, since it is smaller than the sum of its proper divisors (1142913716).

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

721253260 is a wasteful number, since it uses less digits than its factorization.

721253260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396322 (or 396320 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 721253260 is about 26856.1586977736. The cubic root of 721253260 is about 896.8006816978.

The spelling of 721253260 in words is "seven hundred twenty-one million, two hundred fifty-three thousand, two hundred sixty".