623704739 has 4 divisors (see below), whose sum is σ = 712805424. Its totient is φ = 534604056.

The previous prime is 623704733. The next prime is 623704759. The reversal of 623704739 is 937407326.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 623704739 - 2¹² = 623700643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 623704696 and 623704705.

It is not an unprimeable number, because it can be changed into a prime (623704733) 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, 44550332 + ... + 44550345.

It is an arithmetic number, because the mean of its divisors is an integer number (178201356).

Almost surely, 2^623704739 is an apocalyptic number.

623704739 is a deficient number, since it is larger than the sum of its proper divisors (89100685).

623704739 is an equidigital number, since it uses as much as digits as its factorization.

623704739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89100684.

The product of its (nonzero) digits is 190512, while the sum is 41.

The square root of 623704739 is about 24974.0813444659. The cubic root of 623704739 is about 854.3969341489.

The spelling of 623704739 in words is "six hundred twenty-three million, seven hundred four thousand, seven hundred thirty-nine".