84521890 has 8 divisors (see below), whose sum is σ = 152139420. Its totient is φ = 33808752.

The previous prime is 84521837. The next prime is 84521897. The reversal of 84521890 is 9812548.

It can be written as a sum of positive squares in 2 ways, for example, as 80946009 + 3575881 = 8997^2 + 1891^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (84521897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4226085 + ... + 4226104.

Almost surely, 2^84521890 is an apocalyptic number.

84521890 is a deficient number, since it is larger than the sum of its proper divisors (67617530).

84521890 is a wasteful number, since it uses less digits than its factorization.

84521890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8452196.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 84521890 is about 9193.5787373579. The cubic root of 84521890 is about 438.8570370043.

The spelling of 84521890 in words is "eighty-four million, five hundred twenty-one thousand, eight hundred ninety".