78408097 has 4 divisors (see below), whose sum is σ = 83020356. Its totient is φ = 73795840.

The previous prime is 78408091. The next prime is 78408103. The reversal of 78408097 is 79080487.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (78408091) and next prime (78408103).

It can be written as a sum of positive squares in 2 ways, for example, as 41938576 + 36469521 = 6476^2 + 6039^2 .

It is a cyclic number.

It is not a de Polignac number, because 78408097 - 2⁷ = 78407969 is a prime.

It is a super-2 number, since 2×78408097² = 12295659350322818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78408091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2306104 + ... + 2306137.

It is an arithmetic number, because the mean of its divisors is an integer number (20755089).

Almost surely, 2^78408097 is an apocalyptic number.

It is an amenable number.

78408097 is a deficient number, since it is larger than the sum of its proper divisors (4612259).

78408097 is a wasteful number, since it uses less digits than its factorization.

78408097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4612258.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 78408097 is about 8854.8346681347. The cubic root of 78408097 is about 428.0097258832.

The spelling of 78408097 in words is "seventy-eight million, four hundred eight thousand, ninety-seven".