79649661 has 32 divisors (see below), whose sum is σ = 131459328. Its totient is φ = 41771520.

The previous prime is 79649659. The next prime is 79649671. The reversal of 79649661 is 16694697.

79649661 = 463² + 464² + ... + 696².

It is not a de Polignac number, because 79649661 - 2¹ = 79649659 is a prime.

Its product of digits (489888) is a multiple of the sum of its prime divisors (1701).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79649661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79649651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53041 + ... + 54521.

It is an arithmetic number, because the mean of its divisors is an integer number (4108104).

Almost surely, 2^79649661 is an apocalyptic number.

It is an amenable number.

79649661 is a deficient number, since it is larger than the sum of its proper divisors (51809667).

79649661 is a wasteful number, since it uses less digits than its factorization.

79649661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701.

The product of its digits is 489888, while the sum is 48.

The square root of 79649661 is about 8924.6658760987. The cubic root of 79649661 is about 430.2570321948.

The spelling of 79649661 in words is "seventy-nine million, six hundred forty-nine thousand, six hundred sixty-one".