687450431 has 4 divisors (see below), whose sum is σ = 687546192. Its totient is φ = 687354672.

The previous prime is 687450409. The next prime is 687450433. The reversal of 687450431 is 134054786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 687450431 - 2¹⁰ = 687449407 is a prime.

It is a super-2 number, since 2×687450431² = 945176190164171522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687450433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36155 + ... + 51788.

It is an arithmetic number, because the mean of its divisors is an integer number (171886548).

Almost surely, 2^687450431 is an apocalyptic number.

687450431 is a deficient number, since it is larger than the sum of its proper divisors (95761).

687450431 is an equidigital number, since it uses as much as digits as its factorization.

687450431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95760.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 687450431 is about 26219.2759434733. The cubic root of 687450431 is about 882.5658717051.

The spelling of 687450431 in words is "six hundred eighty-seven million, four hundred fifty thousand, four hundred thirty-one".