80742646 has 4 divisors (see below), whose sum is σ = 121113972. Its totient is φ = 40371322.

The previous prime is 80742643. The next prime is 80742671. The reversal of 80742646 is 64624708.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80742643) 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 as a sum of consecutive naturals, namely, 20185660 + ... + 20185663.

It is an arithmetic number, because the mean of its divisors is an integer number (30278493).

Almost surely, 2^80742646 is an apocalyptic number.

80742646 is a deficient number, since it is larger than the sum of its proper divisors (40371326).

80742646 is a wasteful number, since it uses less digits than its factorization.

80742646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40371325.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 80742646 is about 8985.6911809832. The cubic root of 80742646 is about 432.2161519751.

The spelling of 80742646 in words is "eighty million, seven hundred forty-two thousand, six hundred forty-six".