77380281 has 12 divisors (see below), whose sum is σ = 121932720. Its totient is φ = 46897080.

The previous prime is 77380279. The next prime is 77380291. The reversal of 77380281 is 18208377.

It is not a de Polignac number, because 77380281 - 2¹ = 77380279 is a prime.

It is a super-2 number, since 2×77380281² = 11975415775277922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77380231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390711 + ... + 390908.

It is an arithmetic number, because the mean of its divisors is an integer number (10161060).

Almost surely, 2^77380281 is an apocalyptic number.

It is an amenable number.

77380281 is a deficient number, since it is larger than the sum of its proper divisors (44552439).

77380281 is a wasteful number, since it uses less digits than its factorization.

77380281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781636 (or 781633 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 77380281 is about 8796.6062205830. The cubic root of 77380281 is about 426.1312992089.

The spelling of 77380281 in words is "seventy-seven million, three hundred eighty thousand, two hundred eighty-one".