42779533 has 8 divisors (see below), whose sum is σ = 44187768. Its totient is φ = 41393664.

The previous prime is 42779509. The next prime is 42779537. The reversal of 42779533 is 33597724.

It can be written as a sum of positive squares in 4 ways, for example, as 5654884 + 37124649 = 2378^2 + 6093^2 .

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 42779533 - 2⁵ = 42779501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42779537) 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, 1660 + ... + 9397.

It is an arithmetic number, because the mean of its divisors is an integer number (5523471).

Almost surely, 2^42779533 is an apocalyptic number.

It is an amenable number.

42779533 is a deficient number, since it is larger than the sum of its proper divisors (1408235).

42779533 is a wasteful number, since it uses less digits than its factorization.

42779533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11183.

The product of its digits is 158760, while the sum is 40.

The square root of 42779533 is about 6540.6064703512. The cubic root of 42779533 is about 349.7400328040.

The spelling of 42779533 in words is "forty-two million, seven hundred seventy-nine thousand, five hundred thirty-three".