868644540 has 96 divisors (see below), whose sum is σ = 2795688000. Its totient is φ = 223646976.

The previous prime is 868644533. The next prime is 868644559. The reversal of 868644540 is 45446868.

868644540 is a `hidden beast` number, since 8 + 68 + 6 + 44 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 12075 + ... + 43394.

It is an arithmetic number, because the mean of its divisors is an integer number (29121750).

Almost surely, 2^868644540 is an apocalyptic number.

It is an amenable number.

868644540 is an abundant number, since it is smaller than the sum of its proper divisors (1927043460).

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

868644540 is a wasteful number, since it uses less digits than its factorization.

868644540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55516 (or 55508 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The square root of 868644540 is about 29472.7762519923. The cubic root of 868644540 is about 954.1442367256.

The spelling of 868644540 in words is "eight hundred sixty-eight million, six hundred forty-four thousand, five hundred forty".