691706738 has 8 divisors (see below), whose sum is σ = 1082671488. Its totient is φ = 330816244.

The previous prime is 691706731. The next prime is 691706747. The reversal of 691706738 is 837607196.

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

It is a super-2 number, since 2×691706738² = 956916422789201288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 691706692 and 691706701.

It is not an unprimeable number, because it can be changed into a prime (691706731) 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, 7518506 + ... + 7518597.

It is an arithmetic number, because the mean of its divisors is an integer number (135333936).

Almost surely, 2^691706738 is an apocalyptic number.

691706738 is a deficient number, since it is larger than the sum of its proper divisors (390964750).

691706738 is a wasteful number, since it uses less digits than its factorization.

691706738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15037128.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 691706738 is about 26300.3182110027. The cubic root of 691706738 is about 884.3835761932.

The spelling of 691706738 in words is "six hundred ninety-one million, seven hundred six thousand, seven hundred thirty-eight".