687025431 has 24 divisors (see below), whose sum is σ = 1004225040. Its totient is φ = 452578176.

The previous prime is 687025373. The next prime is 687025447. The reversal of 687025431 is 134520786.

It is not a de Polignac number, because 687025431 - 2¹⁴ = 687009047 is a prime.

It is a super-2 number, since 2×687025431² = 944007885681471522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687025481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 290305 + ... + 292661.

It is an arithmetic number, because the mean of its divisors is an integer number (41842710).

Almost surely, 2^687025431 is an apocalyptic number.

687025431 is a deficient number, since it is larger than the sum of its proper divisors (317199609).

687025431 is a wasteful number, since it uses less digits than its factorization.

687025431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735 (or 2732 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 687025431 is about 26211.1699662568. The cubic root of 687025431 is about 882.3839590406.

The spelling of 687025431 in words is "six hundred eighty-seven million, twenty-five thousand, four hundred thirty-one".