78254959 has 4 divisors (see below), whose sum is σ = 78648400. Its totient is φ = 77861520.

The previous prime is 78254933. The next prime is 78254983. The reversal of 78254959 is 95945287.

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

It is a cyclic number.

It is not a de Polignac number, because 78254959 - 2²⁵ = 44700527 is a prime.

It is a super-2 number, since 2×78254959² = 12247677216183362, 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 (78254929) 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, 196422 + ... + 196819.

It is an arithmetic number, because the mean of its divisors is an integer number (19662100).

Almost surely, 2^78254959 is an apocalyptic number.

78254959 is a deficient number, since it is larger than the sum of its proper divisors (393441).

78254959 is a wasteful number, since it uses less digits than its factorization.

78254959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393440.

The product of its digits is 907200, while the sum is 49.

The square root of 78254959 is about 8846.1833012888. The cubic root of 78254959 is about 427.7308972344.

The spelling of 78254959 in words is "seventy-eight million, two hundred fifty-four thousand, nine hundred fifty-nine".