83561730 has 64 divisors (see below), whose sum is σ = 232657920. Its totient is φ = 18811584.

The previous prime is 83561729. The next prime is 83561743. The reversal of 83561730 is 3716538.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 83561691 and 83561700.

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, 11101 + ... + 17039.

It is an arithmetic number, because the mean of its divisors is an integer number (3635280).

Almost surely, 2^83561730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83561730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116328960).

83561730 is an abundant number, since it is smaller than the sum of its proper divisors (149096190).

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

83561730 is a wasteful number, since it uses less digits than its factorization.

83561730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6023.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 83561730 is about 9141.2105325280. The cubic root of 83561730 is about 437.1889140918.

The spelling of 83561730 in words is "eighty-three million, five hundred sixty-one thousand, seven hundred thirty".