78420794 has 8 divisors (see below), whose sum is σ = 119625120. Its totient is φ = 38545756.

The previous prime is 78420781. The next prime is 78420817. The reversal of 78420794 is 49702487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78420794² = 12299641863180872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332174 + ... + 332409.

It is an arithmetic number, because the mean of its divisors is an integer number (14953140).

Almost surely, 2^78420794 is an apocalyptic number.

78420794 is a deficient number, since it is larger than the sum of its proper divisors (41204326).

78420794 is a wasteful number, since it uses less digits than its factorization.

78420794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664644.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 78420794 is about 8855.5515920805. The cubic root of 78420794 is about 428.0328278602.

The spelling of 78420794 in words is "seventy-eight million, four hundred twenty thousand, seven hundred ninety-four".