78265583 has 6 divisors (see below), whose sum is σ = 86027592. Its totient is φ = 71150420.

The previous prime is 78265549. The next prime is 78265609. The reversal of 78265583 is 38556287.

It is not a de Polignac number, because 78265583 - 2¹² = 78261487 is a prime.

It is a super-2 number, since 2×78265583² = 12251002964659778, 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 (78267583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 323291 + ... + 323532.

It is an arithmetic number, because the mean of its divisors is an integer number (14337932).

Almost surely, 2^78265583 is an apocalyptic number.

78265583 is a deficient number, since it is larger than the sum of its proper divisors (7762009).

78265583 is a wasteful number, since it uses less digits than its factorization.

78265583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646845 (or 646834 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 78265583 is about 8846.7837658666. The cubic root of 78265583 is about 427.7502528019.

The spelling of 78265583 in words is "seventy-eight million, two hundred sixty-five thousand, five hundred eighty-three".