78311799 has 8 divisors (see below), whose sum is σ = 116017520. Its totient is φ = 52207848.

The previous prime is 78311791. The next prime is 78311833. The reversal of 78311799 is 99711387.

It is not a de Polignac number, because 78311799 - 2³ = 78311791 is a prime.

It is a super-2 number, since 2×78311799² = 12265475725232802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78311791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1450192 + ... + 1450245.

It is an arithmetic number, because the mean of its divisors is an integer number (14502190).

Almost surely, 2^78311799 is an apocalyptic number.

78311799 is a deficient number, since it is larger than the sum of its proper divisors (37705721).

78311799 is a wasteful number, since it uses less digits than its factorization.

78311799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900446 (or 2900440 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 78311799 is about 8849.3954030770. The cubic root of 78311799 is about 427.8344320584.

The spelling of 78311799 in words is "seventy-eight million, three hundred eleven thousand, seven hundred ninety-nine".