84172291890 has 32 divisors (see below), whose sum is σ = 202114802880. Its totient is φ = 22434688704.

The previous prime is 84172291829. The next prime is 84172291891. The reversal of 84172291890 is 9819227148.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (84172291891) 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, 642580 + ... + 762399.

It is an arithmetic number, because the mean of its divisors is an integer number (6316087590).

Almost surely, 2^84172291890 is an apocalyptic number.

84172291890 is an abundant number, since it is smaller than the sum of its proper divisors (117942510990).

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

84172291890 is a wasteful number, since it uses less digits than its factorization.

84172291890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406986.

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 84172291890 in words is "eighty-four billion, one hundred seventy-two million, two hundred ninety-one thousand, eight hundred ninety".