80978709 has 8 divisors (see below), whose sum is σ = 123396160. Its totient is φ = 46273536.

The previous prime is 80978693. The next prime is 80978743. The reversal of 80978709 is 90787908.

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

It is not a de Polignac number, because 80978709 - 2⁴ = 80978693 is a prime.

It is a super-2 number, since 2×80978709² = 13115102622613362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80978749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1928044 + ... + 1928085.

It is an arithmetic number, because the mean of its divisors is an integer number (15424520).

Almost surely, 2^80978709 is an apocalyptic number.

It is an amenable number.

80978709 is a deficient number, since it is larger than the sum of its proper divisors (42417451).

80978709 is a wasteful number, since it uses less digits than its factorization.

80978709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856139.

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 80978709 is about 8998.8170889290. The cubic root of 80978709 is about 432.6369579731.

The spelling of 80978709 in words is "eighty million, nine hundred seventy-eight thousand, seven hundred nine".