78061597 has 4 divisors (see below), whose sum is σ = 78083676. Its totient is φ = 78039520.

The previous prime is 78061573. The next prime is 78061631. The reversal of 78061597 is 79516087.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36252441 + 41809156 = 6021^2 + 6466^2 .

It is a cyclic number.

It is not a de Polignac number, because 78061597 - 2¹¹ = 78059549 is a prime.

It is a super-2 number, since 2×78061597² = 12187225852380818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78061507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4408 + ... + 13249.

It is an arithmetic number, because the mean of its divisors is an integer number (19520919).

Almost surely, 2^78061597 is an apocalyptic number.

It is an amenable number.

78061597 is a deficient number, since it is larger than the sum of its proper divisors (22079).

78061597 is a wasteful number, since it uses less digits than its factorization.

78061597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22078.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 78061597 is about 8835.2474215497. The cubic root of 78061597 is about 427.3783099254.

The spelling of 78061597 in words is "seventy-eight million, sixty-one thousand, five hundred ninety-seven".