80729938 has 4 divisors (see below), whose sum is σ = 121094910. Its totient is φ = 40364968.

The previous prime is 80729933. The next prime is 80729941. The reversal of 80729938 is 83992708.

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., 61042969 + 19686969 = 7813^2 + 4437^2 .

It is not an unprimeable number, because it can be changed into a prime (80729933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20182483 + ... + 20182486.

Almost surely, 2^80729938 is an apocalyptic number.

80729938 is a deficient number, since it is larger than the sum of its proper divisors (40364972).

80729938 is a wasteful number, since it uses less digits than its factorization.

80729938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40364971.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 80729938 is about 8984.9840289229. The cubic root of 80729938 is about 432.1934754371.

The spelling of 80729938 in words is "eighty million, seven hundred twenty-nine thousand, nine hundred thirty-eight".