77085381 has 8 divisors (see below), whose sum is σ = 102832704. Its totient is φ = 51364160.

The previous prime is 77085377. The next prime is 77085391. The reversal of 77085381 is 18358077.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77085381 - 2² = 77085377 is a prime.

It is a super-2 number, since 2×77085381² = 11884311927830322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77085301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1936 + ... + 12566.

It is an arithmetic number, because the mean of its divisors is an integer number (12854088).

Almost surely, 2^77085381 is an apocalyptic number.

It is an amenable number.

77085381 is a deficient number, since it is larger than the sum of its proper divisors (25747323).

77085381 is a wasteful number, since it uses less digits than its factorization.

77085381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13051.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 77085381 is about 8779.8280734875. The cubic root of 77085381 is about 425.5892743878.

The spelling of 77085381 in words is "seventy-seven million, eighty-five thousand, three hundred eighty-one".