83561070 has 64 divisors (see below), whose sum is σ = 210470400. Its totient is φ = 21191808.

The previous prime is 83561063. The next prime is 83561077. The reversal of 83561070 is 7016538.

It is an interprime number because it is at equal distance from previous prime (83561063) and next prime (83561077).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83561077) 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, 239256 + ... + 239604.

It is an arithmetic number, because the mean of its divisors is an integer number (3288600).

Almost surely, 2^83561070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83561070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105235200).

83561070 is an abundant number, since it is smaller than the sum of its proper divisors (126909330).

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

83561070 is a wasteful number, since it uses less digits than its factorization.

83561070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 83561070 is about 9141.1744322051. The cubic root of 83561070 is about 437.1877630647.

The spelling of 83561070 in words is "eighty-three million, five hundred sixty-one thousand, seventy".