122778065 has 4 divisors (see below), whose sum is σ = 147333684. Its totient is φ = 98222448.

The previous prime is 122778049. The next prime is 122778079. The reversal of 122778065 is 560877221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75759616 + 47018449 = 8704^2 + 6857^2 .

It is a cyclic number.

It is not a de Polignac number, because 122778065 - 2⁴ = 122778049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12277802 + ... + 12277811.

It is an arithmetic number, because the mean of its divisors is an integer number (36833421).

Almost surely, 2^122778065 is an apocalyptic number.

It is an amenable number.

122778065 is a deficient number, since it is larger than the sum of its proper divisors (24555619).

122778065 is an equidigital number, since it uses as much as digits as its factorization.

122778065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24555618.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 122778065 is about 11080.5263864132. The cubic root of 122778065 is about 497.0196908100.

The spelling of 122778065 in words is "one hundred twenty-two million, seven hundred seventy-eight thousand, sixty-five".