1264728694 has 4 divisors (see below), whose sum is σ = 1897093044. Its totient is φ = 632364346.

The previous prime is 1264728679. The next prime is 1264728697. The reversal of 1264728694 is 4968274621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4968274621 = 8689 ⋅571789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264728697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316182172 + ... + 316182175.

It is an arithmetic number, because the mean of its divisors is an integer number (474273261).

Almost surely, 2^1264728694 is an apocalyptic number.

1264728694 is a deficient number, since it is larger than the sum of its proper divisors (632364350).

1264728694 is an equidigital number, since it uses as much as digits as its factorization.

1264728694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632364349.

The product of its digits is 1161216, while the sum is 49.

The square root of 1264728694 is about 35563.0242527263. The cubic root of 1264728694 is about 1081.4317698841.

The spelling of 1264728694 in words is "one billion, two hundred sixty-four million, seven hundred twenty-eight thousand, six hundred ninety-four".