79690987 has 4 divisors (see below), whose sum is σ = 82261696. Its totient is φ = 77120280.

The previous prime is 79690973. The next prime is 79690993. The reversal of 79690987 is 78909697.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78909697 = 7549 ⋅10453.

It is a cyclic number.

It is not a de Polignac number, because 79690987 - 2¹⁹ = 79166699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79690967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285308 + ... + 1285369.

It is an arithmetic number, because the mean of its divisors is an integer number (20565424).

Almost surely, 2^79690987 is an apocalyptic number.

79690987 is a deficient number, since it is larger than the sum of its proper divisors (2570709).

79690987 is a wasteful number, since it uses less digits than its factorization.

79690987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570708.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 79690987 is about 8926.9808446081. The cubic root of 79690987 is about 430.3314318746.

The spelling of 79690987 in words is "seventy-nine million, six hundred ninety thousand, nine hundred eighty-seven".