77043427 has 4 divisors (see below), whose sum is σ = 78306496. Its totient is φ = 75780360.

The previous prime is 77043419. The next prime is 77043433. The reversal of 77043427 is 72434077.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72434077 = 311 ⋅232907.

It is a cyclic number.

It is not a de Polignac number, because 77043427 - 2³ = 77043419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77043392 and 77043401.

It is not an unprimeable number, because it can be changed into a prime (77043437) 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, 631443 + ... + 631564.

It is an arithmetic number, because the mean of its divisors is an integer number (19576624).

Almost surely, 2^77043427 is an apocalyptic number.

77043427 is a deficient number, since it is larger than the sum of its proper divisors (1263069).

77043427 is a wasteful number, since it uses less digits than its factorization.

77043427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263068.

The product of its (nonzero) digits is 32928, while the sum is 34.

The square root of 77043427 is about 8777.4385215734. The cubic root of 77043427 is about 425.5120508710.

The spelling of 77043427 in words is "seventy-seven million, forty-three thousand, four hundred twenty-seven".