80289781 has 16 divisors (see below), whose sum is σ = 95090688. Its totient is φ = 66830400.

The previous prime is 80289779. The next prime is 80289787. The reversal of 80289781 is 18798208.

It is not a de Polignac number, because 80289781 - 2¹ = 80289779 is a prime.

It is a super-2 number, since 2×80289781² = 12892897866055922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80289787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15951 + ... + 20371.

It is an arithmetic number, because the mean of its divisors is an integer number (5943168).

Almost surely, 2^80289781 is an apocalyptic number.

It is an amenable number.

80289781 is a deficient number, since it is larger than the sum of its proper divisors (14800907).

80289781 is a wasteful number, since it uses less digits than its factorization.

80289781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 80289781 is about 8960.4565173879. The cubic root of 80289781 is about 431.4065729582.

The spelling of 80289781 in words is "eighty million, two hundred eighty-nine thousand, seven hundred eighty-one".