80726978 has 4 divisors (see below), whose sum is σ = 121090470. Its totient is φ = 40363488.

The previous prime is 80726969. The next prime is 80726993. The reversal of 80726978 is 87962708.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 70274689 + 10452289 = 8383^2 + 3233^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20181743 + ... + 20181746.

Almost surely, 2^80726978 is an apocalyptic number.

80726978 is a deficient number, since it is larger than the sum of its proper divisors (40363492).

80726978 is a wasteful number, since it uses less digits than its factorization.

80726978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40363491.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 80726978 is about 8984.8193081442. The cubic root of 80726978 is about 432.1881931822.

The spelling of 80726978 in words is "eighty million, seven hundred twenty-six thousand, nine hundred seventy-eight".