84878440644 has 12 divisors (see below), whose sum is σ = 198049694864. Its totient is φ = 28292813544.

The previous prime is 84878440607. The next prime is 84878440651. The reversal of 84878440644 is 44604487848.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×84878440644² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3536601682 + ... + 3536601705.

Almost surely, 2^84878440644 is an apocalyptic number.

It is an amenable number.

84878440644 is an abundant number, since it is smaller than the sum of its proper divisors (113171254220).

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

84878440644 is a wasteful number, since it uses less digits than its factorization.

84878440644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7073203394 (or 7073203392 counting only the distinct ones).

The product of its (nonzero) digits is 22020096, while the sum is 57.

The spelling of 84878440644 in words is "eighty-four billion, eight hundred seventy-eight million, four hundred forty thousand, six hundred forty-four".