77773381 has 8 divisors (see below), whose sum is σ = 89481600. Its totient is φ = 66214608.

The previous prime is 77773337. The next prime is 77773411. The reversal of 77773381 is 18337777.

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 77773381 - 2¹³ = 77765189 is a prime.

It is a super-2 number, since 2×77773381² = 12097397584342322, 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 (77773321) 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, 36241 + ... + 38326.

It is an arithmetic number, because the mean of its divisors is an integer number (11185200).

Almost surely, 2^77773381 is an apocalyptic number.

It is an amenable number.

77773381 is a deficient number, since it is larger than the sum of its proper divisors (11708219).

77773381 is a wasteful number, since it uses less digits than its factorization.

77773381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74723.

The product of its digits is 172872, while the sum is 43.

The square root of 77773381 is about 8818.9217594896. The cubic root of 77773381 is about 426.8516780509.

The spelling of 77773381 in words is "seventy-seven million, seven hundred seventy-three thousand, three hundred eighty-one".