77801243 has 4 divisors (see below), whose sum is σ = 83785968. Its totient is φ = 71816520.

The previous prime is 77801237. The next prime is 77801261. The reversal of 77801243 is 34210877.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34210877 = 47 ⋅727891.

It is a cyclic number.

It is not a de Polignac number, because 77801243 - 2⁶ = 77801179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77801543) 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, 2992343 + ... + 2992368.

It is an arithmetic number, because the mean of its divisors is an integer number (20946492).

Almost surely, 2^77801243 is an apocalyptic number.

77801243 is a deficient number, since it is larger than the sum of its proper divisors (5984725).

77801243 is a wasteful number, since it uses less digits than its factorization.

77801243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5984724.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 77801243 is about 8820.5012896093. The cubic root of 77801243 is about 426.9026445958.

The spelling of 77801243 in words is "seventy-seven million, eight hundred one thousand, two hundred forty-three".