687240406 has 8 divisors (see below), whose sum is σ = 1031174784. Its totient is φ = 343515480.

The previous prime is 687240397. The next prime is 687240409. The reversal of 687240406 is 604042786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687240409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43885 + ... + 57448.

It is an arithmetic number, because the mean of its divisors is an integer number (128896848).

Almost surely, 2^687240406 is an apocalyptic number.

687240406 is a deficient number, since it is larger than the sum of its proper divisors (343934378).

687240406 is a wasteful number, since it uses less digits than its factorization.

687240406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104726.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 687240406 is about 26215.2704735236. The cubic root of 687240406 is about 882.4759841202.

It can be divided in two parts, 6872 and 40406, that added together give a triangular number (47278 = T₃₀₇).

The spelling of 687240406 in words is "six hundred eighty-seven million, two hundred forty thousand, four hundred six".