1264138790 has 16 divisors (see below), whose sum is σ = 2323864512. Its totient is φ = 494896704.

The previous prime is 1264138789. The next prime is 1264138817. The reversal of 1264138790 is 978314621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344359 + ... + 1345298.

It is an arithmetic number, because the mean of its divisors is an integer number (145241532).

Almost surely, 2^1264138790 is an apocalyptic number.

1264138790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1264138790 is a deficient number, since it is larger than the sum of its proper divisors (1059725722).

1264138790 is a wasteful number, since it uses less digits than its factorization.

1264138790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689711.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1264138790 is about 35554.7295025570. The cubic root of 1264138790 is about 1081.2636072998.

The spelling of 1264138790 in words is "one billion, two hundred sixty-four million, one hundred thirty-eight thousand, seven hundred ninety".