1261237080 has 64 divisors (see below), whose sum is σ = 3876012000. Its totient is φ = 328125440.

The previous prime is 1261237073. The next prime is 1261237111. The reversal of 1261237080 is 807321621.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123255 + ... + 133094.

Almost surely, 2^1261237080 is an apocalyptic number.

1261237080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261237080 is an abundant number, since it is smaller than the sum of its proper divisors (2614774920).

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

1261237080 is a wasteful number, since it uses less digits than its factorization.

1261237080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256404 (or 256400 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1261237080 is about 35513.8998140165. The cubic root of 1261237080 is about 1080.4356609978.

The spelling of 1261237080 in words is "one billion, two hundred sixty-one million, two hundred thirty-seven thousand, eighty".