78564838 has 16 divisors (see below), whose sum is σ = 132036624. Its totient is φ = 34745760.

The previous prime is 78564823. The next prime is 78564853. The reversal of 78564838 is 83846587.

It is an interprime number because it is at equal distance from previous prime (78564823) and next prime (78564853).

It is a junction number, because it is equal to n+sod(n) for n = 78564791 and 78564800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47445 + ... + 49072.

It is an arithmetic number, because the mean of its divisors is an integer number (8252289).

Almost surely, 2^78564838 is an apocalyptic number.

78564838 is a deficient number, since it is larger than the sum of its proper divisors (53471786).

78564838 is a wasteful number, since it uses less digits than its factorization.

78564838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96567.

The product of its digits is 1290240, while the sum is 49.

The square root of 78564838 is about 8863.6808381169. The cubic root of 78564838 is about 428.2947390454.

The spelling of 78564838 in words is "seventy-eight million, five hundred sixty-four thousand, eight hundred thirty-eight".