84857680 has 20 divisors (see below), whose sum is σ = 197294292. Its totient is φ = 33943040.

The previous prime is 84857677. The next prime is 84857681. The reversal of 84857680 is 8675848.

It can be written as a sum of positive squares in 2 ways, for example, as 25321024 + 59536656 = 5032^2 + 7716^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 84857680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84857681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530281 + ... + 530440.

Almost surely, 2^84857680 is an apocalyptic number.

84857680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84857680 is an abundant number, since it is smaller than the sum of its proper divisors (112436612).

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

84857680 is a wasteful number, since it uses less digits than its factorization.

84857680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060734 (or 1060728 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 46.

The square root of 84857680 is about 9211.8228380706. The cubic root of 84857680 is about 439.4374353060.

The spelling of 84857680 in words is "eighty-four million, eight hundred fifty-seven thousand, six hundred eighty".