42664784 has 20 divisors (see below), whose sum is σ = 82801620. Its totient is φ = 21296640.

The previous prime is 42664753. The next prime is 42664813. The reversal of 42664784 is 48746624.

It can be written as a sum of positive squares in 2 ways, for example, as 11751184 + 30913600 = 3428^2 + 5560^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9464 + ... + 13224.

It is an arithmetic number, because the mean of its divisors is an integer number (4140081).

Almost surely, 2^42664784 is an apocalyptic number.

It is an amenable number.

42664784 is a deficient number, since it is larger than the sum of its proper divisors (40136836).

42664784 is a wasteful number, since it uses less digits than its factorization.

42664784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4478 (or 4472 counting only the distinct ones).

The product of its digits is 258048, while the sum is 41.

The square root of 42664784 is about 6531.8285341855. The cubic root of 42664784 is about 349.4270462539.

The spelling of 42664784 in words is "forty-two million, six hundred sixty-four thousand, seven hundred eighty-four".