80879749 has 8 divisors (see below), whose sum is σ = 82891512. Its totient is φ = 78886080.

The previous prime is 80879741. The next prime is 80879767. The reversal of 80879749 is 94797808.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 42810849 + 38068900 = 6543^2 + 6170^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80879749 - 2³ = 80879741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80879696 and 80879705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80879741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4759 + ... + 13579.

It is an arithmetic number, because the mean of its divisors is an integer number (10361439).

Almost surely, 2^80879749 is an apocalyptic number.

It is an amenable number.

80879749 is a deficient number, since it is larger than the sum of its proper divisors (2011763).

80879749 is a wasteful number, since it uses less digits than its factorization.

80879749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9047.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 80879749 is about 8993.3169075709. The cubic root of 80879749 is about 432.4606515262.

The spelling of 80879749 in words is "eighty million, eight hundred seventy-nine thousand, seven hundred forty-nine".