78197895 has 24 divisors (see below), whose sum is σ = 138430656. Its totient is φ = 40817088.

The previous prime is 78197893. The next prime is 78197897. The reversal of 78197895 is 59879187.

It is an interprime number because it is at equal distance from previous prime (78197893) and next prime (78197897).

It is not a de Polignac number, because 78197895 - 2¹ = 78197893 is a prime.

It is a super-2 number, since 2×78197895² = 12229821564862050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78197893) 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, 16372 + ... + 20601.

It is an arithmetic number, because the mean of its divisors is an integer number (5767944).

Almost surely, 2^78197895 is an apocalyptic number.

78197895 is a deficient number, since it is larger than the sum of its proper divisors (60232761).

78197895 is a wasteful number, since it uses less digits than its factorization.

78197895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37031 (or 37028 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 54.

The square root of 78197895 is about 8842.9573673065. The cubic root of 78197895 is about 427.6269039477.

The spelling of 78197895 in words is "seventy-eight million, one hundred ninety-seven thousand, eight hundred ninety-five".