686432925 has 18 divisors (see below), whose sum is σ = 1229478042. Its totient is φ = 366097440.

The previous prime is 686432921. The next prime is 686432993. The reversal of 686432925 is 529234686.

It can be written as a sum of positive squares in 3 ways, for example, as 168506361 + 517926564 = 12981^2 + 22758^2 .

It is not a de Polignac number, because 686432925 - 2² = 686432921 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 not an unprimeable number, because it can be changed into a prime (686432921) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1525182 + ... + 1525631.

Almost surely, 2^686432925 is an apocalyptic number.

It is an amenable number.

686432925 is a deficient number, since it is larger than the sum of its proper divisors (543045117).

686432925 is a wasteful number, since it uses less digits than its factorization.

686432925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050829 (or 3050821 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 686432925 is about 26199.8649805681. The cubic root of 686432925 is about 882.1302235722.

The spelling of 686432925 in words is "six hundred eighty-six million, four hundred thirty-two thousand, nine hundred twenty-five".