78415651 has 8 divisors (see below), whose sum is σ = 80269280. Its totient is φ = 76583232.

The previous prime is 78415643. The next prime is 78415669. The reversal of 78415651 is 15651487.

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 78415651 - 2³ = 78415643 is a prime.

It is a super-2 number, since 2×78415651² = 12298028643507602, 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 78415651.

It is not an unprimeable number, because it can be changed into a prime (78416651) 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, 2305 + ... + 12733.

It is an arithmetic number, because the mean of its divisors is an integer number (10033660).

Almost surely, 2^78415651 is an apocalyptic number.

78415651 is a deficient number, since it is larger than the sum of its proper divisors (1853629).

78415651 is a wasteful number, since it uses less digits than its factorization.

78415651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605.

The product of its digits is 33600, while the sum is 37.

The square root of 78415651 is about 8855.2612045044. The cubic root of 78415651 is about 428.0234705591.

The spelling of 78415651 in words is "seventy-eight million, four hundred fifteen thousand, six hundred fifty-one".