1264863880 has 64 divisors (see below), whose sum is σ = 3255840000. Its totient is φ = 433223424.

The previous prime is 1264863823. The next prime is 1264863881. The reversal of 1264863880 is 883684621.

It is a self number, because there is not a number n which added to its sum of digits gives 1264863880.

It is not an unprimeable number, because it can be changed into a prime (1264863881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390106 + ... + 393334.

It is an arithmetic number, because the mean of its divisors is an integer number (50872500).

Almost surely, 2^1264863880 is an apocalyptic number.

1264863880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264863880 is an abundant number, since it is smaller than the sum of its proper divisors (1990976120).

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

1264863880 is a wasteful number, since it uses less digits than its factorization.

1264863880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4646 (or 4642 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The square root of 1264863880 is about 35564.9248558183. The cubic root of 1264863880 is about 1081.4702996830.

The spelling of 1264863880 in words is "one billion, two hundred sixty-four million, eight hundred sixty-three thousand, eight hundred eighty".