84444990 has 64 divisors (see below), whose sum is σ = 232450560. Its totient is φ = 19232640.

The previous prime is 84444977. The next prime is 84445033. The reversal of 84444990 is 9944448.

It is a super-2 number, since 2×84444990² = 14261912672200200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79060 + ... + 80120.

It is an arithmetic number, because the mean of its divisors is an integer number (3632040).

Almost surely, 2^84444990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84444990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116225280).

84444990 is an abundant number, since it is smaller than the sum of its proper divisors (148005570).

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

84444990 is a wasteful number, since it uses less digits than its factorization.

84444990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 84444990 is about 9189.3955187488. The cubic root of 84444990 is about 438.7239024745.

The spelling of 84444990 in words is "eighty-four million, four hundred forty-four thousand, nine hundred ninety".