78311849 has 24 divisors (see below), whose sum is σ = 103716288. Its totient is φ = 58359840.

The previous prime is 78311839. The next prime is 78311851. The reversal of 78311849 is 94811387.

It is not a de Polignac number, because 78311849 - 2⁴ = 78311833 is a prime.

It is a super-2 number, since 2×78311849² = 12265491387597602, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78311839) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9239 + ... + 15555.

It is an arithmetic number, because the mean of its divisors is an integer number (4321512).

Almost surely, 2^78311849 is an apocalyptic number.

It is an amenable number.

78311849 is a deficient number, since it is larger than the sum of its proper divisors (25404439).

78311849 is a wasteful number, since it uses less digits than its factorization.

78311849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6365 (or 6358 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 78311849 is about 8849.3982281283. The cubic root of 78311849 is about 427.8345231120.

The spelling of 78311849 in words is "seventy-eight million, three hundred eleven thousand, eight hundred forty-nine".