79407661 has 12 divisors (see below), whose sum is σ = 85274812. Its totient is φ = 73884096.

The previous prime is 79407649. The next prime is 79407667. The reversal of 79407661 is 16670497.

It can be written as a sum of positive squares in 2 ways, for example, as 57608100 + 21799561 = 7590^2 + 4669^2 .

It is not a de Polignac number, because 79407661 - 2⁹ = 79407149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79407667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17545 + ... + 21601.

Almost surely, 2^79407661 is an apocalyptic number.

It is an amenable number.

79407661 is a deficient number, since it is larger than the sum of its proper divisors (5867151).

79407661 is a wasteful number, since it uses less digits than its factorization.

79407661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140 (or 4117 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 79407661 is about 8911.0976316052. The cubic root of 79407661 is about 429.8208393702.

The spelling of 79407661 in words is "seventy-nine million, four hundred seven thousand, six hundred sixty-one".