78041817 has 12 divisors (see below), whose sum is σ = 128831040. Its totient is φ = 44595288.

The previous prime is 78041741. The next prime is 78041839. The reversal of 78041817 is 71814087.

It is not a de Polignac number, because 78041817 - 2¹⁰ = 78040793 is a prime.

It is a super-2 number, since 2×78041817² = 12181050401322978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78041867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 619317 + ... + 619442.

It is an arithmetic number, because the mean of its divisors is an integer number (10735920).

Almost surely, 2^78041817 is an apocalyptic number.

It is an amenable number.

78041817 is a deficient number, since it is larger than the sum of its proper divisors (50789223).

78041817 is a wasteful number, since it uses less digits than its factorization.

78041817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238772 (or 1238769 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 78041817 is about 8834.1279705470. The cubic root of 78041817 is about 427.3422091306.

The spelling of 78041817 in words is "seventy-eight million, forty-one thousand, eight hundred seventeen".