709681623 has 32 divisors (see below), whose sum is σ = 1117863936. Its totient is φ = 392076768.

The previous prime is 709681619. The next prime is 709681631. The reversal of 709681623 is 326186907.

It is a happy number.

It is not a de Polignac number, because 709681623 - 2² = 709681619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (709681603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77590 + ... + 86252.

It is an arithmetic number, because the mean of its divisors is an integer number (34933248).

Almost surely, 2^709681623 is an apocalyptic number.

709681623 is a deficient number, since it is larger than the sum of its proper divisors (408182313).

709681623 is a wasteful number, since it uses less digits than its factorization.

709681623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8803.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 709681623 is about 26639.8502811108. The cubic root of 709681623 is about 891.9787740363.

The spelling of 709681623 in words is "seven hundred nine million, six hundred eighty-one thousand, six hundred twenty-three".