1865487928956 has 96 divisors (see below), whose sum is σ = 4590786715200. Its totient is φ = 588683397120.

The previous prime is 1865487928891. The next prime is 1865487928979. The reversal of 1865487928956 is 6598297845681.

It is a super-2 number, since 2×1865487928956² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29644966 + ... + 29707826.

It is an arithmetic number, because the mean of its divisors is an integer number (47820694950).

Almost surely, 2^{1865487928956} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1865487928956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2295393357600).

1865487928956 is an abundant number, since it is smaller than the sum of its proper divisors (2725298786244).

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

1865487928956 is a wasteful number, since it uses less digits than its factorization.

1865487928956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64559 (or 64557 counting only the distinct ones).

The product of its digits is 2090188800, while the sum is 78.

The spelling of 1865487928956 in words is "one trillion, eight hundred sixty-five billion, four hundred eighty-seven million, nine hundred twenty-eight thousand, nine hundred fifty-six".