687611925 has 288 divisors, whose sum is σ = 1715890176. Its totient is φ = 254016000.

The previous prime is 687611921. The next prime is 687611929. The reversal of 687611925 is 529116786.

687611925 is a `hidden beast` number, since 6 + 8 + 7 + 611 + 9 + 25 = 666.

It is an interprime number because it is at equal distance from previous prime (687611921) and next prime (687611929).

It is not a de Polignac number, because 687611925 - 2² = 687611921 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 (687611921) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 9684640 + ... + 9684710.

It is an arithmetic number, because the mean of its divisors is an integer number (5957952).

Almost surely, 2^687611925 is an apocalyptic number.

687611925 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

687611925 is an abundant number, since it is smaller than the sum of its proper divisors (1028278251).

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

687611925 is a wasteful number, since it uses less digits than its factorization.

687611925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 153 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 687611925 is about 26222.3554433998. The cubic root of 687611925 is about 882.6349762917.

The spelling of 687611925 in words is "six hundred eighty-seven million, six hundred eleven thousand, nine hundred twenty-five".