84639929220 has 288 divisors, whose sum is σ = 321060370176. Its totient is φ = 17534361600.

The previous prime is 84639929191. The next prime is 84639929233. The reversal of 84639929220 is 2292993648.

84639929220 is a `hidden beast` number, since 8 + 4 + 6 + 399 + 29 + 220 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4661760 + ... + 4679880.

It is an arithmetic number, because the mean of its divisors is an integer number (1114792952).

Almost surely, 2^84639929220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84639929220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160530185088).

84639929220 is an abundant number, since it is smaller than the sum of its proper divisors (236420440956).

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

84639929220 is a wasteful number, since it uses less digits than its factorization.

84639929220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18491 (or 18486 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 84639929220 in words is "eighty-four billion, six hundred thirty-nine million, nine hundred twenty-nine thousand, two hundred twenty".