1215641080 has 32 divisors (see below), whose sum is σ = 2854116000. Its totient is φ = 465114496.

The previous prime is 1215641047. The next prime is 1215641087. The reversal of 1215641080 is 801465121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215641087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659755 + ... + 661594.

It is an arithmetic number, because the mean of its divisors is an integer number (89191125).

Almost surely, 2^1215641080 is an apocalyptic number.

1215641080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215641080 is an abundant number, since it is smaller than the sum of its proper divisors (1638474920).

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

1215641080 is a wasteful number, since it uses less digits than its factorization.

1215641080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321383 (or 1321379 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 1215641080 is about 34866.0448000630. The cubic root of 1215641080 is about 1067.2556335057.

The spelling of 1215641080 in words is "one billion, two hundred fifteen million, six hundred forty-one thousand, eighty".