42788623 has 4 divisors (see below), whose sum is σ = 43061320. Its totient is φ = 42515928.

The previous prime is 42788621. The next prime is 42788651. The reversal of 42788623 is 32688724.

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

It is a cyclic number.

It is not a de Polignac number, because 42788623 - 2¹ = 42788621 is a prime.

It is a super-2 number, since 2×42788623² = 3661732516472258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42788621) 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, 136113 + ... + 136426.

It is an arithmetic number, because the mean of its divisors is an integer number (10765330).

Almost surely, 2^42788623 is an apocalyptic number.

42788623 is a deficient number, since it is larger than the sum of its proper divisors (272697).

42788623 is a wasteful number, since it uses less digits than its factorization.

42788623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272696.

The product of its digits is 129024, while the sum is 40.

The square root of 42788623 is about 6541.3013231314. The cubic root of 42788623 is about 349.7648025286.

The spelling of 42788623 in words is "forty-two million, seven hundred eighty-eight thousand, six hundred twenty-three".