83645690 has 16 divisors (see below), whose sum is σ = 151110792. Its totient is φ = 33336384.

The previous prime is 83645677. The next prime is 83645717. The reversal of 83645690 is 9654638.

It can be written as a sum of positive squares in 4 ways, for example, as 43335889 + 40309801 = 6583^2 + 6349^2 .

It is a super-2 number, since 2×83645690² = 13993202911152200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12329 + ... + 17868.

Almost surely, 2^83645690 is an apocalyptic number.

83645690 is a deficient number, since it is larger than the sum of its proper divisors (67465102).

83645690 is a wasteful number, since it uses less digits than its factorization.

83645690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30481.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 83645690 is about 9145.8017691179. The cubic root of 83645690 is about 437.3352892897.

The spelling of 83645690 in words is "eighty-three million, six hundred forty-five thousand, six hundred ninety".