77806123 has 4 divisors (see below), whose sum is σ = 77830848. Its totient is φ = 77781400.

The previous prime is 77806117. The next prime is 77806129. The reversal of 77806123 is 32160877.

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

It is an interprime number because it is at equal distance from previous prime (77806117) and next prime (77806129).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77806123 is a prime.

It is a super-2 number, since 2×77806123² = 12107585552582258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77806129) 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 3 ways as a sum of consecutive naturals, for example, 6811 + ... + 14212.

It is an arithmetic number, because the mean of its divisors is an integer number (19457712).

Almost surely, 2^77806123 is an apocalyptic number.

77806123 is a deficient number, since it is larger than the sum of its proper divisors (24725).

77806123 is a wasteful number, since it uses less digits than its factorization.

77806123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24724.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 77806123 is about 8820.7779135403. Note that the first 3 decimals coincide. The cubic root of 77806123 is about 426.9115700802.

The spelling of 77806123 in words is "seventy-seven million, eight hundred six thousand, one hundred twenty-three".