1264213635 has 32 divisors (see below), whose sum is σ = 2116651008. Its totient is φ = 643541760.

The previous prime is 1264213633. The next prime is 1264213663. The reversal of 1264213635 is 5363124621.

It is not a de Polignac number, because 1264213635 - 2¹ = 1264213633 is a prime.

It is a super-2 number, since 2×1264213635² = 3196472229839826450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1264213596 and 1264213605.

It is not an unprimeable number, because it can be changed into a prime (1264213633) 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, 15324 + ... + 52566.

It is an arithmetic number, because the mean of its divisors is an integer number (66145344).

Almost surely, 2^1264213635 is an apocalyptic number.

1264213635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1264213635 is a deficient number, since it is larger than the sum of its proper divisors (852437373).

1264213635 is a wasteful number, since it uses less digits than its factorization.

1264213635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37355.

The product of its digits is 25920, while the sum is 33.

The square root of 1264213635 is about 35555.7820192441. The cubic root of 1264213635 is about 1081.2849460901.

The spelling of 1264213635 in words is "one billion, two hundred sixty-four million, two hundred thirteen thousand, six hundred thirty-five".