8721625 has 16 divisors (see below), whose sum is σ = 11875968. Its totient is φ = 6342000.

The previous prime is 8721617. The next prime is 8721631. The reversal of 8721625 is 5261278.

It is not a de Polignac number, because 8721625 - 2³ = 8721617 is a prime.

It is a Duffinian number.

8721625 is a lucky number.

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, 1797 + ... + 4546.

It is an arithmetic number, because the mean of its divisors is an integer number (742248).

Almost surely, 2^8721625 is an apocalyptic number.

It is an amenable number.

8721625 is a deficient number, since it is larger than the sum of its proper divisors (3154343).

8721625 is a wasteful number, since it uses less digits than its factorization.

8721625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6369 (or 6359 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 8721625 is about 2953.2397464480. The cubic root of 8721625 is about 205.8412781204.

It can be divided in two parts, 87 and 21625, that added together give a palindrome (21712).

The spelling of 8721625 in words is "eight million, seven hundred twenty-one thousand, six hundred twenty-five".