78402235 has 4 divisors (see below), whose sum is σ = 94082688. Its totient is φ = 62721784.

The previous prime is 78402229. The next prime is 78402271. The reversal of 78402235 is 53220487.

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 78402235 - 2⁹ = 78401723 is a prime.

It is a super-2 number, since 2×78402235² = 12293820905990450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78402197 and 78402206.

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, 7840219 + ... + 7840228.

It is an arithmetic number, because the mean of its divisors is an integer number (23520672).

Almost surely, 2^78402235 is an apocalyptic number.

78402235 is a deficient number, since it is larger than the sum of its proper divisors (15680453).

78402235 is a wasteful number, since it uses less digits than its factorization.

78402235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15680452.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 78402235 is about 8854.5036563322. The cubic root of 78402235 is about 427.9990592316. Note that the first 3 decimals are identical.

The spelling of 78402235 in words is "seventy-eight million, four hundred two thousand, two hundred thirty-five".