1072640723 has 24 divisors (see below), whose sum is σ = 1363154544. Its totient is φ = 834624000.

The previous prime is 1072640717. The next prime is 1072640759. The reversal of 1072640723 is 3270462701.

It is not a de Polignac number, because 1072640723 - 2²⁰ = 1071592147 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1072640723.

It is not an unprimeable number, because it can be changed into a prime (1072640783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 646511 + ... + 648167.

It is an arithmetic number, because the mean of its divisors is an integer number (56798106).

Almost surely, 2^1072640723 is an apocalyptic number.

1072640723 is a deficient number, since it is larger than the sum of its proper divisors (290513821).

1072640723 is a wasteful number, since it uses less digits than its factorization.

1072640723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883 (or 2876 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 1072640723 is about 32751.1942225013. The cubic root of 1072640723 is about 1023.6498497008.

The spelling of 1072640723 in words is "one billion, seventy-two million, six hundred forty thousand, seven hundred twenty-three".