78420607 has 4 divisors (see below), whose sum is σ = 80950336. Its totient is φ = 75890880.

The previous prime is 78420599. The next prime is 78420613. The reversal of 78420607 is 70602487.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78420607 - 2³ = 78420599 is a prime.

It is a super-2 number, since 2×78420607² = 12299583204496898, 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 (78420697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1264818 + ... + 1264879.

It is an arithmetic number, because the mean of its divisors is an integer number (20237584).

Almost surely, 2^78420607 is an apocalyptic number.

78420607 is a deficient number, since it is larger than the sum of its proper divisors (2529729).

78420607 is a wasteful number, since it uses less digits than its factorization.

78420607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529728.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 78420607 is about 8855.5410337257. The cubic root of 78420607 is about 428.0324876350.

The spelling of 78420607 in words is "seventy-eight million, four hundred twenty thousand, six hundred seven".