78366403 has 4 divisors (see below), whose sum is σ = 78764400. Its totient is φ = 77968408.

The previous prime is 78366377. The next prime is 78366443. The reversal of 78366403 is 30466387.

It is a happy number.

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 78366403 - 2⁵ = 78366371 is a prime.

It is a super-2 number, since 2×78366403² = 12282586238316818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78366443) 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, 198703 + ... + 199096.

It is an arithmetic number, because the mean of its divisors is an integer number (19691100).

Almost surely, 2^78366403 is an apocalyptic number.

78366403 is a deficient number, since it is larger than the sum of its proper divisors (397997).

78366403 is a wasteful number, since it uses less digits than its factorization.

78366403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397996.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 78366403 is about 8852.4800479866. The cubic root of 78366403 is about 427.9338468083.

The spelling of 78366403 in words is "seventy-eight million, three hundred sixty-six thousand, four hundred three".