78332581 has 8 divisors (see below), whose sum is σ = 79682400. Its totient is φ = 76988208.

The previous prime is 78332563. The next prime is 78332669. The reversal of 78332581 is 18523387.

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 78332581 - 2¹⁵ = 78299813 is a prime.

It is a super-2 number, since 2×78332581² = 12271986492243122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78332581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78332561) 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, 36270 + ... + 38368.

It is an arithmetic number, because the mean of its divisors is an integer number (9960300).

Almost surely, 2^78332581 is an apocalyptic number.

It is an amenable number.

78332581 is a deficient number, since it is larger than the sum of its proper divisors (1349819).

78332581 is a wasteful number, since it uses less digits than its factorization.

78332581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723.

The product of its digits is 40320, while the sum is 37.

The square root of 78332581 is about 8850.5695296969. The cubic root of 78332581 is about 427.8722742435.

The spelling of 78332581 in words is "seventy-eight million, three hundred thirty-two thousand, five hundred eighty-one".