78340581 has 32 divisors (see below), whose sum is σ = 130051200. Its totient is φ = 46189440.

The previous prime is 78340541. The next prime is 78340597. The reversal of 78340581 is 18504387.

78340581 is a `hidden beast` number, since 78 + 3 + 4 + 0 + 581 = 666.

It is not a de Polignac number, because 78340581 - 2⁶ = 78340517 is a prime.

It is a super-2 number, since 2×78340581² = 12274493262835122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78340501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7425 + ... + 14553.

It is an arithmetic number, because the mean of its divisors is an integer number (4064100).

Almost surely, 2^78340581 is an apocalyptic number.

It is an amenable number.

78340581 is a deficient number, since it is larger than the sum of its proper divisors (51710619).

78340581 is a wasteful number, since it uses less digits than its factorization.

78340581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7186 (or 7180 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 78340581 is about 8851.0214664749. The cubic root of 78340581 is about 427.8868397522.

The spelling of 78340581 in words is "seventy-eight million, three hundred forty thousand, five hundred eighty-one".