77882381 has 4 divisors (see below), whose sum is σ = 77900064. Its totient is φ = 77864700.

The previous prime is 77882359. The next prime is 77882383. The reversal of 77882381 is 18328877.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18328877 = 7 ⋅2618411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77882381 is a prime.

It is a super-2 number, since 2×77882381² = 12131330540458322, 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 (77882383) 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, 3626 + ... + 12996.

It is an arithmetic number, because the mean of its divisors is an integer number (19475016).

Almost surely, 2^77882381 is an apocalyptic number.

It is an amenable number.

77882381 is a deficient number, since it is larger than the sum of its proper divisors (17683).

77882381 is an equidigital number, since it uses as much as digits as its factorization.

77882381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17682.

The product of its digits is 150528, while the sum is 44.

The square root of 77882381 is about 8825.0994895242. The cubic root of 77882381 is about 427.0509969494.

The spelling of 77882381 in words is "seventy-seven million, eight hundred eighty-two thousand, three hundred eighty-one".