78672581 has 8 divisors (see below), whose sum is σ = 88408320. Its totient is φ = 69463152.

The previous prime is 78672571. The next prime is 78672593. The reversal of 78672581 is 18527687.

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 78672581 - 2¹⁴ = 78656197 is a prime.

It is a super-2 number, since 2×78672581² = 12378750002403122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78672571) 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, 131261 + ... + 131858.

It is an arithmetic number, because the mean of its divisors is an integer number (11051040).

Almost surely, 2^78672581 is an apocalyptic number.

It is an amenable number.

78672581 is a deficient number, since it is larger than the sum of its proper divisors (9735739).

78672581 is a wasteful number, since it uses less digits than its factorization.

78672581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263155.

The product of its digits is 188160, while the sum is 44.

The square root of 78672581 is about 8869.7565355538. The cubic root of 78672581 is about 428.4904359275.

The spelling of 78672581 in words is "seventy-eight million, six hundred seventy-two thousand, five hundred eighty-one".