1264101640 has 32 divisors (see below), whose sum is σ = 3011537880. Its totient is φ = 475896832.

The previous prime is 1264101637. The next prime is 1264101701. The reversal of 1264101640 is 461014621.

It can be written as a sum of positive squares in 4 ways, for example, as 799871524 + 464230116 = 28282^2 + 21546^2 .

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, 928807 + ... + 930166.

Almost surely, 2^1264101640 is an apocalyptic number.

1264101640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264101640 is an abundant number, since it is smaller than the sum of its proper divisors (1747436240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1264101640 is a wasteful number, since it uses less digits than its factorization.

1264101640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859001 (or 1858997 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1264101640 is about 35554.2070647061. The cubic root of 1264101640 is about 1081.2530152833.

The spelling of 1264101640 in words is "one billion, two hundred sixty-four million, one hundred one thousand, six hundred forty".