78265397 has 20 divisors (see below), whose sum is σ = 93878316. Its totient is φ = 65197440.

The previous prime is 78265349. The next prime is 78265441. The reversal of 78265397 is 79356287.

It can be written as a sum of positive squares in 2 ways, for example, as 43112356 + 35153041 = 6566^2 + 5929^2 .

It is not a de Polignac number, because 78265397 - 2⁶ = 78265333 is a prime.

It is a super-2 number, since 2×78265397² = 12250944735135218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78265097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 88397 + ... + 89277.

Almost surely, 2^78265397 is an apocalyptic number.

It is an amenable number.

78265397 is a deficient number, since it is larger than the sum of its proper divisors (15612919).

78265397 is an frugal number, since it uses more digits than its factorization.

78265397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 925 counting only the distinct ones).

The product of its digits is 635040, while the sum is 47.

The square root of 78265397 is about 8846.7732535654. The cubic root of 78265397 is about 427.7499139488.

The spelling of 78265397 in words is "seventy-eight million, two hundred sixty-five thousand, three hundred ninety-seven".