77240231 has 4 divisors (see below), whose sum is σ = 81783792. Its totient is φ = 72696672.

The previous prime is 77240221. The next prime is 77240243. The reversal of 77240231 is 13204277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13204277 = 23 ⋅574099.

It is a cyclic number.

It is not a de Polignac number, because 77240231 - 2⁶ = 77240167 is a prime.

It is a super-2 number, since 2×77240231² = 11932106569866722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77240231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77240221) 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, 2271755 + ... + 2271788.

It is an arithmetic number, because the mean of its divisors is an integer number (20445948).

Almost surely, 2^77240231 is an apocalyptic number.

77240231 is a deficient number, since it is larger than the sum of its proper divisors (4543561).

77240231 is a wasteful number, since it uses less digits than its factorization.

77240231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4543560.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 77240231 is about 8788.6421590596. The cubic root of 77240231 is about 425.8740599892.

The spelling of 77240231 in words is "seventy-seven million, two hundred forty thousand, two hundred thirty-one".