78347916 has 18 divisors (see below), whose sum is σ = 198046212. Its totient is φ = 26115960.

The previous prime is 78347911. The next prime is 78347921. The reversal of 78347916 is 61974387.

It is an interprime number because it is at equal distance from previous prime (78347911) and next prime (78347921).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×78347916² = 12276791883086112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78347911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1088130 + ... + 1088201.

Almost surely, 2^78347916 is an apocalyptic number.

It is an amenable number.

78347916 is an abundant number, since it is smaller than the sum of its proper divisors (119698296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78347916 is a wasteful number, since it uses less digits than its factorization.

78347916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176341 (or 2176336 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 78347916 is about 8851.4358157307. The cubic root of 78347916 is about 427.9001936317.

The spelling of 78347916 in words is "seventy-eight million, three hundred forty-seven thousand, nine hundred sixteen".