77285381 has 2 divisors, whose sum is σ = 77285382. Its totient is φ = 77285380.

The previous prime is 77285357. The next prime is 77285413. The reversal of 77285381 is 18358277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73017025 + 4268356 = 8545^2 + 2066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77285381 is a prime.

It is a super-2 number, since 2×77285381² = 11946060232630322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77285081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38642690 + 38642691.

It is an arithmetic number, because the mean of its divisors is an integer number (38642691).

Almost surely, 2^77285381 is an apocalyptic number.

It is an amenable number.

77285381 is a deficient number, since it is larger than the sum of its proper divisors (1).

77285381 is an equidigital number, since it uses as much as digits as its factorization.

77285381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 41.

The square root of 77285381 is about 8791.2104399792. The cubic root of 77285381 is about 425.9570239585.

The spelling of 77285381 in words is "seventy-seven million, two hundred eighty-five thousand, three hundred eighty-one".