731616646 has 8 divisors (see below), whose sum is σ = 1103996880. Its totient is φ = 363617688.

The previous prime is 731616643. The next prime is 731616659. The reversal of 731616646 is 646616137.

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

It is a junction number, because it is equal to n+sod(n) for n = 731616599 and 731616608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731616643) 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, 1094901 + ... + 1095568.

It is an arithmetic number, because the mean of its divisors is an integer number (137999610).

Almost surely, 2^731616646 is an apocalyptic number.

731616646 is a deficient number, since it is larger than the sum of its proper divisors (372380234).

731616646 is a wasteful number, since it uses less digits than its factorization.

731616646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190638.

The product of its digits is 108864, while the sum is 40.

The square root of 731616646 is about 27048.4130033538. The cubic root of 731616646 is about 901.0755232634.

The spelling of 731616646 in words is "seven hundred thirty-one million, six hundred sixteen thousand, six hundred forty-six".