84447990 has 96 divisors (see below), whose sum is σ = 241297056. Its totient is φ = 20321280.

The previous prime is 84447983. The next prime is 84447991. The reversal of 84447990 is 9974448.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84447991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 194814 + ... + 195246.

It is an arithmetic number, because the mean of its divisors is an integer number (2513511).

Almost surely, 2^84447990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84447990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120648528).

84447990 is an abundant number, since it is smaller than the sum of its proper divisors (156849066).

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

84447990 is a wasteful number, since it uses less digits than its factorization.

84447990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 84447990 is about 9189.5587489280. The cubic root of 84447990 is about 438.7290977940.

The spelling of 84447990 in words is "eighty-four million, four hundred forty-seven thousand, nine hundred ninety".