78399963 has 24 divisors (see below), whose sum is σ = 118095120. Its totient is φ = 50057280.

The previous prime is 78399953. The next prime is 78399973. The reversal of 78399963 is 36999387.

It is an interprime number because it is at equal distance from previous prime (78399953) and next prime (78399973).

It is not a de Polignac number, because 78399963 - 2¹⁰ = 78398939 is a prime.

It is a super-2 number, since 2×78399963² = 12293108396802738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78399953) 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, 33045 + ... + 35337.

It is an arithmetic number, because the mean of its divisors is an integer number (4920630).

Almost surely, 2^78399963 is an apocalyptic number.

78399963 is a deficient number, since it is larger than the sum of its proper divisors (39695157).

78399963 is a wasteful number, since it uses less digits than its factorization.

78399963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459 (or 2456 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 78399963 is about 8854.3753591092. The cubic root of 78399963 is about 427.9949248969.

The spelling of 78399963 in words is "seventy-eight million, three hundred ninety-nine thousand, nine hundred sixty-three".