687972753 has 12 divisors (see below), whose sum is σ = 1070180020. Its totient is φ = 423367776.

The previous prime is 687972751. The next prime is 687972773. The reversal of 687972753 is 357279786.

It can be written as a sum of positive squares in 2 ways, for example, as 314246529 + 373726224 = 17727^2 + 19332^2 .

It is not a de Polignac number, because 687972753 - 2¹ = 687972751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687972753.

It is not an unprimeable number, because it can be changed into a prime (687972751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2939938 + ... + 2940171.

Almost surely, 2^687972753 is an apocalyptic number.

It is an amenable number.

687972753 is a deficient number, since it is larger than the sum of its proper divisors (382207267).

687972753 is a wasteful number, since it uses less digits than its factorization.

687972753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5880128 (or 5880125 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 54.

The square root of 687972753 is about 26229.2347009973. The cubic root of 687972753 is about 882.7893384205.

The spelling of 687972753 in words is "six hundred eighty-seven million, nine hundred seventy-two thousand, seven hundred fifty-three".