78415789 has 8 divisors (see below), whose sum is σ = 80474240. Its totient is φ = 76368096.

The previous prime is 78415759. The next prime is 78415801. The reversal of 78415789 is 98751487.

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 78415789 - 2²¹ = 76318637 is a prime.

It is a super-2 number, since 2×78415789² = 12298071928985042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78415759) 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, 13297 + ... + 18265.

It is an arithmetic number, because the mean of its divisors is an integer number (10059280).

Almost surely, 2^78415789 is an apocalyptic number.

It is an amenable number.

78415789 is a deficient number, since it is larger than the sum of its proper divisors (2058451).

78415789 is a wasteful number, since it uses less digits than its factorization.

78415789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5379.

The product of its digits is 564480, while the sum is 49.

The square root of 78415789 is about 8855.2689964789. The cubic root of 78415789 is about 428.0237216450.

The spelling of 78415789 in words is "seventy-eight million, four hundred fifteen thousand, seven hundred eighty-nine".