78838567 has 2 divisors, whose sum is σ = 78838568. Its totient is φ = 78838566.

The previous prime is 78838483. The next prime is 78838577. The reversal of 78838567 is 76583887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78838567 - 2⁷ = 78838439 is a prime.

It is a super-2 number, since 2×78838567² = 12431039293226978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78838577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39419283 + 39419284.

It is an arithmetic number, because the mean of its divisors is an integer number (39419284).

Almost surely, 2^78838567 is an apocalyptic number.

78838567 is a deficient number, since it is larger than the sum of its proper divisors (1).

78838567 is an equidigital number, since it uses as much as digits as its factorization.

78838567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 52.

The square root of 78838567 is about 8879.1084574973. The cubic root of 78838567 is about 428.7915719847.

The spelling of 78838567 in words is "seventy-eight million, eight hundred thirty-eight thousand, five hundred sixty-seven".