42778633 has 4 divisors (see below), whose sum is σ = 45030160. Its totient is φ = 40527108.

The previous prime is 42778627. The next prime is 42778663. The reversal of 42778633 is 33687724.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42778633 is a prime.

It is a super-2 number, since 2×42778633² = 3660022882697378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42778663) 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, 1125735 + ... + 1125772.

It is an arithmetic number, because the mean of its divisors is an integer number (11257540).

Almost surely, 2^42778633 is an apocalyptic number.

It is an amenable number.

42778633 is a deficient number, since it is larger than the sum of its proper divisors (2251527).

42778633 is a wasteful number, since it uses less digits than its factorization.

42778633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251526.

The product of its digits is 169344, while the sum is 40.

The square root of 42778633 is about 6540.5376690300. The cubic root of 42778633 is about 349.7375801652.

Subtracting from 42778633 its reverse (33687724), we obtain a palindrome (9090909).

The spelling of 42778633 in words is "forty-two million, seven hundred seventy-eight thousand, six hundred thirty-three".