78027897 has 4 divisors (see below), whose sum is σ = 104037200. Its totient is φ = 52018596.

The previous prime is 78027877. The next prime is 78027907. The reversal of 78027897 is 79872087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79872087 = 3 ⋅26624029.

It is a de Polignac number, because none of the positive numbers 2^k-78027897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78027827) 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, 13004647 + ... + 13004652.

It is an arithmetic number, because the mean of its divisors is an integer number (26009300).

Almost surely, 2^78027897 is an apocalyptic number.

It is an amenable number.

78027897 is a deficient number, since it is larger than the sum of its proper divisors (26009303).

78027897 is a wasteful number, since it uses less digits than its factorization.

78027897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26009302.

The product of its (nonzero) digits is 395136, while the sum is 48.

The square root of 78027897 is about 8833.3400817584. The cubic root of 78027897 is about 427.3167998587.

The spelling of 78027897 in words is "seventy-eight million, twenty-seven thousand, eight hundred ninety-seven".