2115717880 has 32 divisors (see below), whose sum is σ = 4762184400. Its totient is φ = 845963776.

The previous prime is 2115717829. The next prime is 2115717931. The reversal of 2115717880 is 887175112.

It is an interprime number because it is at equal distance from previous prime (2115717829) and next prime (2115717931).

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, 114999 + ... + 132121.

Almost surely, 2^2115717880 is an apocalyptic number.

2115717880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2115717880 is an abundant number, since it is smaller than the sum of its proper divisors (2646466520).

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

2115717880 is a wasteful number, since it uses less digits than its factorization.

2115717880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20223 (or 20219 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 40.

The square root of 2115717880 is about 45996.9333760415. The cubic root of 2115717880 is about 1283.7661459507.

The spelling of 2115717880 in words is "two billion, one hundred fifteen million, seven hundred seventeen thousand, eight hundred eighty".