688532406 has 16 divisors (see below), whose sum is σ = 1377868800. Its totient is φ = 229376808.

The previous prime is 688532389. The next prime is 688532417. The reversal of 688532406 is 604235886.

It is a super-2 number, since 2×688532406² = 948153748224297672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22066 + ... + 43173.

It is an arithmetic number, because the mean of its divisors is an integer number (86116800).

Almost surely, 2^688532406 is an apocalyptic number.

688532406 is an abundant number, since it is smaller than the sum of its proper divisors (689336394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688532406 is a wasteful number, since it uses less digits than its factorization.

688532406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67003.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 688532406 is about 26239.9010287768. The cubic root of 688532406 is about 883.0286510927.

Adding to 688532406 its product of nonzero digits (276480), we get a palindrome (688808886).

The spelling of 688532406 in words is "six hundred eighty-eight million, five hundred thirty-two thousand, four hundred six".