77307381 has 12 divisors (see below), whose sum is σ = 118235052. Its totient is φ = 48506496.

The previous prime is 77307379. The next prime is 77307383. The reversal of 77307381 is 18370377.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77307379) and next prime (77307383).

It can be written as a sum of positive squares in 2 ways, for example, as 22043025 + 55264356 = 4695^2 + 7434^2 .

It is not a de Polignac number, because 77307381 - 2¹ = 77307379 is a prime.

It is a super-2 number, since 2×77307381² = 11952862314158322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77307383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 252486 + ... + 252791.

It is an arithmetic number, because the mean of its divisors is an integer number (9852921).

Almost surely, 2^77307381 is an apocalyptic number.

It is an amenable number.

77307381 is a deficient number, since it is larger than the sum of its proper divisors (40927671).

77307381 is a wasteful number, since it uses less digits than its factorization.

77307381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505300 (or 505297 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 77307381 is about 8792.4616007123. The cubic root of 77307381 is about 425.9974376623.

The spelling of 77307381 in words is "seventy-seven million, three hundred seven thousand, three hundred eighty-one".