78612641 has 8 divisors (see below), whose sum is σ = 84480480. Its totient is φ = 72883008.

The previous prime is 78612637. The next prime is 78612647. The reversal of 78612641 is 14621687.

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 78612641 - 2² = 78612637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78612647) 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, 33371 + ... + 35648.

It is an arithmetic number, because the mean of its divisors is an integer number (10560060).

Almost surely, 2^78612641 is an apocalyptic number.

It is an amenable number.

78612641 is a deficient number, since it is larger than the sum of its proper divisors (5867839).

78612641 is a wasteful number, since it uses less digits than its factorization.

78612641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69103.

The product of its digits is 16128, while the sum is 35.

The square root of 78612641 is about 8866.3769940151. The cubic root of 78612641 is about 428.3815871524.

The spelling of 78612641 in words is "seventy-eight million, six hundred twelve thousand, six hundred forty-one".