78399416 has 8 divisors (see below), whose sum is σ = 146998920. Its totient is φ = 39199704.

The previous prime is 78399401. The next prime is 78399437. The reversal of 78399416 is 61499387.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78399416² = 12292936858282112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4899956 + ... + 4899971.

It is an arithmetic number, because the mean of its divisors is an integer number (18374865).

Almost surely, 2^78399416 is an apocalyptic number.

It is an amenable number.

78399416 is a deficient number, since it is larger than the sum of its proper divisors (68599504).

78399416 is a wasteful number, since it uses less digits than its factorization.

78399416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9799933 (or 9799929 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 78399416 is about 8854.3444703716. The cubic root of 78399416 is about 427.9939295147.

The spelling of 78399416 in words is "seventy-eight million, three hundred ninety-nine thousand, four hundred sixteen".