721312725 has 48 divisors (see below), whose sum is σ = 1372233600. Its totient is φ = 327494400.

The previous prime is 721312723. The next prime is 721312727. The reversal of 721312725 is 527213127.

It is an interprime number because it is at equal distance from previous prime (721312723) and next prime (721312727).

It is not a de Polignac number, because 721312725 - 2¹ = 721312723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721312692 and 721312701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721312721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73615 + ... + 82835.

It is an arithmetic number, because the mean of its divisors is an integer number (28588200).

Almost surely, 2^721312725 is an apocalyptic number.

721312725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

721312725 is a deficient number, since it is larger than the sum of its proper divisors (650920875).

721312725 is a wasteful number, since it uses less digits than its factorization.

721312725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9390 (or 9385 counting only the distinct ones).

The product of its digits is 5880, while the sum is 30.

The square root of 721312725 is about 26857.2657766944. The cubic root of 721312725 is about 896.8253271263.

The spelling of 721312725 in words is "seven hundred twenty-one million, three hundred twelve thousand, seven hundred twenty-five".