684616725 has 96 divisors (see below), whose sum is σ = 1377689600. Its totient is φ = 331257600.

The previous prime is 684616697. The next prime is 684616739. The reversal of 684616725 is 527616486.

684616725 is a `hidden beast` number, since 6 + 8 + 4 + 616 + 7 + 25 = 666.

It is not a de Polignac number, because 684616725 - 2⁵ = 684616693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 534636 + ... + 535914.

Almost surely, 2^684616725 is an apocalyptic number.

684616725 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

684616725 is an abundant number, since it is smaller than the sum of its proper divisors (693072875).

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

684616725 is a wasteful number, since it uses less digits than its factorization.

684616725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372 (or 1361 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 684616725 is about 26165.1815395957. The cubic root of 684616725 is about 881.3515410384.

The spelling of 684616725 in words is "six hundred eighty-four million, six hundred sixteen thousand, seven hundred twenty-five".