687693542 has 4 divisors (see below), whose sum is σ = 1031540316. Its totient is φ = 343846770.

The previous prime is 687693541. The next prime is 687693563. The reversal of 687693542 is 245396786.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687693541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171923384 + ... + 171923387.

It is an arithmetic number, because the mean of its divisors is an integer number (257885079).

Almost surely, 2^687693542 is an apocalyptic number.

687693542 is a deficient number, since it is larger than the sum of its proper divisors (343846774).

687693542 is a wasteful number, since it uses less digits than its factorization.

687693542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343846773.

The product of its digits is 2177280, while the sum is 50.

The square root of 687693542 is about 26223.9116456718. The cubic root of 687693542 is about 882.6698967491.

The spelling of 687693542 in words is "six hundred eighty-seven million, six hundred ninety-three thousand, five hundred forty-two".