80781755 has 4 divisors (see below), whose sum is σ = 96938112. Its totient is φ = 64625400.

The previous prime is 80781737. The next prime is 80781763. The reversal of 80781755 is 55718708.

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

It is not a de Polignac number, because 80781755 - 2¹⁸ = 80519611 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8078171 + ... + 8078180.

It is an arithmetic number, because the mean of its divisors is an integer number (24234528).

Almost surely, 2^80781755 is an apocalyptic number.

80781755 is a deficient number, since it is larger than the sum of its proper divisors (16156357).

80781755 is a wasteful number, since it uses less digits than its factorization.

80781755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16156356.

The product of its (nonzero) digits is 78400, while the sum is 41.

The square root of 80781755 is about 8987.8670995960. The cubic root of 80781755 is about 432.2859243275.

The spelling of 80781755 in words is "eighty million, seven hundred eighty-one thousand, seven hundred fifty-five".