3865499778870 has 48 divisors (see below), whose sum is σ = 10050413677200. Its totient is φ = 1030788222912.

The previous prime is 3865499778863. The next prime is 3865499778883. The reversal of 3865499778870 is 788779945683.

3865499778870 is a `hidden beast` number, since 386 + 5 + 4 + 9 + 97 + 7 + 88 + 70 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 3865499778870.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10172332 + ... + 10545488.

It is an arithmetic number, because the mean of its divisors is an integer number (209383618275).

Almost surely, 2^{3865499778870} is an apocalyptic number.

3865499778870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3865499778870 is an abundant number, since it is smaller than the sum of its proper divisors (6184913898330).

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

3865499778870 is a wasteful number, since it uses less digits than its factorization.

3865499778870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488269 (or 488266 counting only the distinct ones).

The product of its (nonzero) digits is 5120962560, while the sum is 81.

The spelling of 3865499778870 in words is "three trillion, eight hundred sixty-five billion, four hundred ninety-nine million, seven hundred seventy-eight thousand, eight hundred seventy".