42778324 has 24 divisors (see below), whose sum is σ = 80572968. Its totient is φ = 19799040.

The previous prime is 42778303. The next prime is 42778349. The reversal of 42778324 is 42387724.

It can be written as a sum of positive squares in 4 ways, for example, as 1587600 + 41190724 = 1260^2 + 6418^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009 + ... + 9304.

It is an arithmetic number, because the mean of its divisors is an integer number (3357207).

Almost surely, 2^42778324 is an apocalyptic number.

It is an amenable number.

42778324 is a deficient number, since it is larger than the sum of its proper divisors (37794644).

42778324 is a wasteful number, since it uses less digits than its factorization.

42778324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10395 (or 10393 counting only the distinct ones).

The product of its digits is 75264, while the sum is 37.

The square root of 42778324 is about 6540.5140470761. The cubic root of 42778324 is about 349.7367380845.

The spelling of 42778324 in words is "forty-two million, seven hundred seventy-eight thousand, three hundred twenty-four".