83491290 has 64 divisors (see below), whose sum is σ = 230342400. Its totient is φ = 21494592.

The previous prime is 83491283. The next prime is 83491297. The reversal of 83491290 is 9219438.

83491290 is a `hidden beast` number, since 83 + 491 + 2 + 90 = 666.

It is an interprime number because it is at equal distance from previous prime (83491283) and next prime (83491297).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83491297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2499 + ... + 13161.

It is an arithmetic number, because the mean of its divisors is an integer number (3599100).

Almost surely, 2^83491290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83491290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115171200).

83491290 is an abundant number, since it is smaller than the sum of its proper divisors (146851110).

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

83491290 is a wasteful number, since it uses less digits than its factorization.

83491290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10708 (or 10702 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 83491290 is about 9137.3568388238. The cubic root of 83491290 is about 437.0660338993.

The spelling of 83491290 in words is "eighty-three million, four hundred ninety-one thousand, two hundred ninety".