1261925680 has 40 divisors (see below), whose sum is σ = 3028627584. Its totient is φ = 488486400.

The previous prime is 1261925627. The next prime is 1261925719. The reversal of 1261925680 is 865291621.

1261925680 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 251941 + ... + 256900.

Almost surely, 2^1261925680 is an apocalyptic number.

1261925680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261925680 is an abundant number, since it is smaller than the sum of its proper divisors (1766701904).

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

1261925680 is a wasteful number, since it uses less digits than its factorization.

1261925680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508885 (or 508879 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 1261925680 is about 35523.5932867158. The cubic root of 1261925680 is about 1080.6322543928.

The spelling of 1261925680 in words is "one billion, two hundred sixty-one million, nine hundred twenty-five thousand, six hundred eighty".