721646125 has 32 divisors (see below), whose sum is σ = 971268480. Its totient is φ = 533520000.

The previous prime is 721646083. The next prime is 721646129. The reversal of 721646125 is 521646127.

It is not a de Polignac number, because 721646125 - 2²⁵ = 688091693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721646129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93670 + ... + 101080.

It is an arithmetic number, because the mean of its divisors is an integer number (30352140).

Almost surely, 2^721646125 is an apocalyptic number.

It is an amenable number.

721646125 is a deficient number, since it is larger than the sum of its proper divisors (249622355).

721646125 is a wasteful number, since it uses less digits than its factorization.

721646125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7486 (or 7476 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 721646125 is about 26863.4719461204. The cubic root of 721646125 is about 896.9634805689.

The spelling of 721646125 in words is "seven hundred twenty-one million, six hundred forty-six thousand, one hundred twenty-five".