77441381 has 4 divisors (see below), whose sum is σ = 77580972. Its totient is φ = 77301792.

The previous prime is 77441369. The next prime is 77441387. The reversal of 77441381 is 18314477.

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 24661156 + 52780225 = 4966^2 + 7265^2 .

It is a cyclic number.

It is not a de Polignac number, because 77441381 - 2¹⁰ = 77440357 is a prime.

It is a super-2 number, since 2×77441381² = 11994334982374322, 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 (77441387) 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, 68960 + ... + 70073.

It is an arithmetic number, because the mean of its divisors is an integer number (19395243).

Almost surely, 2^77441381 is an apocalyptic number.

It is an amenable number.

77441381 is a deficient number, since it is larger than the sum of its proper divisors (139591).

77441381 is a wasteful number, since it uses less digits than its factorization.

77441381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139590.

The product of its digits is 18816, while the sum is 35.

The square root of 77441381 is about 8800.0784655593. The cubic root of 77441381 is about 426.2434284324.

The spelling of 77441381 in words is "seventy-seven million, four hundred forty-one thousand, three hundred eighty-one".