42788881 has 4 divisors (see below), whose sum is σ = 45305892. Its totient is φ = 40271872.

The previous prime is 42788873. The next prime is 42788899. The reversal of 42788881 is 18888724.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36240400 + 6548481 = 6020^2 + 2559^2 .

It is a cyclic number.

It is not a de Polignac number, because 42788881 - 2³ = 42788873 is a prime.

It is a super-2 number, since 2×42788881² = 3661776674464322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42788831) 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, 1258480 + ... + 1258513.

It is an arithmetic number, because the mean of its divisors is an integer number (11326473).

Almost surely, 2^42788881 is an apocalyptic number.

It is an amenable number.

42788881 is a deficient number, since it is larger than the sum of its proper divisors (2517011).

42788881 is a wasteful number, since it uses less digits than its factorization.

42788881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517010.

The product of its digits is 229376, while the sum is 46.

The square root of 42788881 is about 6541.3210439482. The cubic root of 42788881 is about 349.7655055125.

The spelling of 42788881 in words is "forty-two million, seven hundred eighty-eight thousand, eight hundred eighty-one".