84878438540 has 48 divisors (see below), whose sum is σ = 204080846592. Its totient is φ = 29047951296.

The previous prime is 84878438537. The next prime is 84878438543. The reversal of 84878438540 is 4583487848.

It is an interprime number because it is at equal distance from previous prime (84878438537) and next prime (84878438543).

It is a self number, because there is not a number n which added to its sum of digits gives 84878438540.

It is not an unprimeable number, because it can be changed into a prime (84878438543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477602 + ... + 630761.

It is an arithmetic number, because the mean of its divisors is an integer number (4251684304).

Almost surely, 2^84878438540 is an apocalyptic number.

It is an amenable number.

84878438540 is an abundant number, since it is smaller than the sum of its proper divisors (119202408052).

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

84878438540 is a wasteful number, since it uses less digits than its factorization.

84878438540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108926 (or 1108924 counting only the distinct ones).

The product of its (nonzero) digits is 27525120, while the sum is 59.

The spelling of 84878438540 in words is "eighty-four billion, eight hundred seventy-eight million, four hundred thirty-eight thousand, five hundred forty".