80487781 has 8 divisors (see below), whose sum is σ = 92426400. Its totient is φ = 69319440.

The previous prime is 80487779. The next prime is 80487817. The reversal of 80487781 is 18778408.

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 80487781 - 2¹ = 80487779 is a prime.

It is a super-2 number, since 2×80487781² = 12956565780607922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80487481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192346 + ... + 192763.

It is an arithmetic number, because the mean of its divisors is an integer number (11553300).

Almost surely, 2^80487781 is an apocalyptic number.

It is an amenable number.

80487781 is a deficient number, since it is larger than the sum of its proper divisors (11938619).

80487781 is a wasteful number, since it uses less digits than its factorization.

80487781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385139.

The product of its (nonzero) digits is 100352, while the sum is 43.

The square root of 80487781 is about 8971.4982583736. The cubic root of 80487781 is about 431.7609077212.

The spelling of 80487781 in words is "eighty million, four hundred eighty-seven thousand, seven hundred eighty-one".