79987261 has 16 divisors (see below), whose sum is σ = 89005824. Its totient is φ = 71495424.

The previous prime is 79987241. The next prime is 79987273. The reversal of 79987261 is 16278997.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 79987261 - 2⁹ = 79986749 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 (79987211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60736 + ... + 62038.

It is an arithmetic number, because the mean of its divisors is an integer number (5562864).

Almost surely, 2^79987261 is an apocalyptic number.

It is an amenable number.

79987261 is a deficient number, since it is larger than the sum of its proper divisors (9018563).

79987261 is a wasteful number, since it uses less digits than its factorization.

79987261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500.

The product of its digits is 381024, while the sum is 49.

The square root of 79987261 is about 8943.5597498982. The cubic root of 79987261 is about 430.8640656727.

The spelling of 79987261 in words is "seventy-nine million, nine hundred eighty-seven thousand, two hundred sixty-one".