80775781 has 8 divisors (see below), whose sum is σ = 82926144. Its totient is φ = 78634080.

The previous prime is 80775769. The next prime is 80775787. The reversal of 80775781 is 18757708.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 80775781 - 2⁹ = 80775269 is a prime.

It is a super-2 number, since 2×80775781² = 13049453592319922, 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 (80775787) 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 in 7 ways as a sum of consecutive naturals, for example, 19560 + ... + 23326.

It is an arithmetic number, because the mean of its divisors is an integer number (10365768).

Almost surely, 2^80775781 is an apocalyptic number.

It is an amenable number.

80775781 is a deficient number, since it is larger than the sum of its proper divisors (2150363).

80775781 is a wasteful number, since it uses less digits than its factorization.

80775781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331.

The product of its (nonzero) digits is 109760, while the sum is 43.

The square root of 80775781 is about 8987.5347565392. The cubic root of 80775781 is about 432.2752678793.

The spelling of 80775781 in words is "eighty million, seven hundred seventy-five thousand, seven hundred eighty-one".