1263790920 has 64 divisors (see below), whose sum is σ = 4333000320. Its totient is φ = 288866304.

The previous prime is 1263790903. The next prime is 1263790921. The reversal of 1263790920 is 290973621.

1263790920 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1263790921) 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, 751417 + ... + 753096.

It is an arithmetic number, because the mean of its divisors is an integer number (67703130).

Almost surely, 2^1263790920 is an apocalyptic number.

1263790920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263790920 is an abundant number, since it is smaller than the sum of its proper divisors (3069209400).

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

1263790920 is a wasteful number, since it uses less digits than its factorization.

1263790920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504534 (or 1504530 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 1263790920 is about 35549.8371304286. The cubic root of 1263790920 is about 1081.1644162717.

The spelling of 1263790920 in words is "one billion, two hundred sixty-three million, seven hundred ninety thousand, nine hundred twenty".