78880191 has 16 divisors (see below), whose sum is σ = 119226240. Its totient is φ = 45986400.

The previous prime is 78880183. The next prime is 78880201. The reversal of 78880191 is 19108887.

It is not a de Polignac number, because 78880191 - 2³ = 78880183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78880111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52485 + ... + 53966.

It is an arithmetic number, because the mean of its divisors is an integer number (7451640).

Almost surely, 2^78880191 is an apocalyptic number.

78880191 is a deficient number, since it is larger than the sum of its proper divisors (40346049).

78880191 is a wasteful number, since it uses less digits than its factorization.

78880191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106486.

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 78880191 is about 8881.4520772225. The cubic root of 78880191 is about 428.8670210149.

The spelling of 78880191 in words is "seventy-eight million, eight hundred eighty thousand, one hundred ninety-one".