78273897 has 16 divisors (see below), whose sum is σ = 113752128. Its totient is φ = 47586240.

The previous prime is 78273893. The next prime is 78273917. The reversal of 78273897 is 79837287.

It is not a de Polignac number, because 78273897 - 2² = 78273893 is a prime.

It is a super-2 number, since 2×78273897² = 12253605903133218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78273893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8854 + ... + 15327.

It is an arithmetic number, because the mean of its divisors is an integer number (7109508).

Almost surely, 2^78273897 is an apocalyptic number.

It is an amenable number.

78273897 is a deficient number, since it is larger than the sum of its proper divisors (35478231).

78273897 is a wasteful number, since it uses less digits than its factorization.

78273897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24280.

The product of its digits is 1185408, while the sum is 51.

The square root of 78273897 is about 8847.2536416676. The cubic root of 78273897 is about 427.7653986236.

The spelling of 78273897 in words is "seventy-eight million, two hundred seventy-three thousand, eight hundred ninety-seven".