77243381 has 4 divisors (see below), whose sum is σ = 77492064. Its totient is φ = 76994700.

The previous prime is 77243377. The next prime is 77243399. The reversal of 77243381 is 18334277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77243381 - 2² = 77243377 is a prime.

It is a super-2 number, since 2×77243381² = 11933079816622322, 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 (77243321) 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, 123875 + ... + 124496.

It is an arithmetic number, because the mean of its divisors is an integer number (19373016).

Almost surely, 2^77243381 is an apocalyptic number.

It is an amenable number.

77243381 is a deficient number, since it is larger than the sum of its proper divisors (248683).

77243381 is a wasteful number, since it uses less digits than its factorization.

77243381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248682.

The product of its digits is 28224, while the sum is 35.

The square root of 77243381 is about 8788.8213658033. The cubic root of 77243381 is about 425.8798492220.

The spelling of 77243381 in words is "seventy-seven million, two hundred forty-three thousand, three hundred eighty-one".