2157612880 has 40 divisors (see below), whose sum is σ = 5024747592. Its totient is φ = 861617664.

The previous prime is 2157612871. The next prime is 2157612913. The reversal of 2157612880 is 882167512.

It can be written as a sum of positive squares in 4 ways, for example, as 68757264 + 2088855616 = 8292^2 + 45704^2 .

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 a congruent number.

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, 27042 + ... + 71038.

Almost surely, 2^2157612880 is an apocalyptic number.

2157612880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157612880 is an abundant number, since it is smaller than the sum of its proper divisors (2867134712).

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

2157612880 is a wasteful number, since it uses less digits than its factorization.

2157612880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44623 (or 44617 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 2157612880 is about 46450.1117329119. Note that the first 3 decimals coincide. The cubic root of 2157612880 is about 1292.1844445881.

The spelling of 2157612880 in words is "two billion, one hundred fifty-seven million, six hundred twelve thousand, eight hundred eighty".