1617870864 has 20 divisors (see below), whose sum is σ = 4179499856. Its totient is φ = 539290272.

The previous prime is 1617870809. The next prime is 1617870893. The reversal of 1617870864 is 4680787161.

It is a super-2 number, since 2×1617870864² = 5235012265160212992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 33705643 = 1617870864 / (1 + 6 + 1 + 7 + 8 + 7 + 0 + 8 + 6 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16852774 + ... + 16852869.

Almost surely, 2^1617870864 is an apocalyptic number.

It is an amenable number.

1617870864 is an abundant number, since it is smaller than the sum of its proper divisors (2561628992).

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

1617870864 is a wasteful number, since it uses less digits than its factorization.

1617870864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33705654 (or 33705648 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 1617870864 is about 40222.7654941825. The cubic root of 1617870864 is about 1173.9455429719.

The spelling of 1617870864 in words is "one billion, six hundred seventeen million, eight hundred seventy thousand, eight hundred sixty-four".