681379402 has 32 divisors (see below), whose sum is σ = 1130163840. Its totient is φ = 305526720.

The previous prime is 681379381. The next prime is 681379417. The reversal of 681379402 is 204973186.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 881088 + ... + 881860.

It is an arithmetic number, because the mean of its divisors is an integer number (35317620).

Almost surely, 2^681379402 is an apocalyptic number.

681379402 is a deficient number, since it is larger than the sum of its proper divisors (448784438).

681379402 is a wasteful number, since it uses less digits than its factorization.

681379402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 681379402 is about 26103.2450473116. The cubic root of 681379402 is about 879.9601402400.

It can be divided in two parts, 681 and 379402, that added together give a palindrome (380083).

The spelling of 681379402 in words is "six hundred eighty-one million, three hundred seventy-nine thousand, four hundred two".