8643251540 has 48 divisors (see below), whose sum is σ = 22629608064. Its totient is φ = 2694000000.

The previous prime is 8643251531. The next prime is 8643251587. The reversal of 8643251540 is 451523468.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 8643251494 and 8643251503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2804711 + ... + 2807790.

It is an arithmetic number, because the mean of its divisors is an integer number (471450168).

Almost surely, 2^8643251540 is an apocalyptic number.

It is an amenable number.

8643251540 is an abundant number, since it is smaller than the sum of its proper divisors (13986356524).

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

8643251540 is a wasteful number, since it uses less digits than its factorization.

8643251540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5612528 (or 5612526 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 8643251540 is about 92969.0891640872. The cubic root of 8643251540 is about 2052.2285136904.

The spelling of 8643251540 in words is "eight billion, six hundred forty-three million, two hundred fifty-one thousand, five hundred forty".