78801405 has 16 divisors (see below), whose sum is σ = 126196800. Its totient is φ = 41989248.

The previous prime is 78801377. The next prime is 78801431. The reversal of 78801405 is 50410887.

It is a happy number.

It is not a de Polignac number, because 78801405 - 2⁷ = 78801277 is a prime.

It is a super-2 number, since 2×78801405² = 12419322859948050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24321 + ... + 27369.

It is an arithmetic number, because the mean of its divisors is an integer number (7887300).

Almost surely, 2^78801405 is an apocalyptic number.

It is an amenable number.

78801405 is a deficient number, since it is larger than the sum of its proper divisors (47395395).

78801405 is a wasteful number, since it uses less digits than its factorization.

78801405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 78801405 is about 8877.0155457789. The cubic root of 78801405 is about 428.7241884803.

The spelling of 78801405 in words is "seventy-eight million, eight hundred one thousand, four hundred five".