77855384 has 16 divisors (see below), whose sum is σ = 150688320. Its totient is φ = 37671840.

The previous prime is 77855383. The next prime is 77855389. The reversal of 77855384 is 48355877.

It is a happy number.

It is a super-2 number, since 2×77855384² = 12122921635574912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77855381) 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, 156719 + ... + 157214.

It is an arithmetic number, because the mean of its divisors is an integer number (9418020).

Almost surely, 2^77855384 is an apocalyptic number.

It is an amenable number.

77855384 is a deficient number, since it is larger than the sum of its proper divisors (72832936).

77855384 is a wasteful number, since it uses less digits than its factorization.

77855384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313970 (or 313966 counting only the distinct ones).

The product of its digits is 940800, while the sum is 47.

The square root of 77855384 is about 8823.5697991233. The cubic root of 77855384 is about 427.0016471992.

The spelling of 77855384 in words is "seventy-seven million, eight hundred fifty-five thousand, three hundred eighty-four".