42157768 has 16 divisors (see below), whose sum is σ = 81596160. Its totient is φ = 20398800.

The previous prime is 42157747. The next prime is 42157769. The reversal of 42157768 is 86775124.

It is a self number, because there is not a number n which added to its sum of digits gives 42157768.

It is not an unprimeable number, because it can be changed into a prime (42157769) 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, 84748 + ... + 85243.

It is an arithmetic number, because the mean of its divisors is an integer number (5099760).

Almost surely, 2^42157768 is an apocalyptic number.

It is an amenable number.

42157768 is a deficient number, since it is larger than the sum of its proper divisors (39438392).

42157768 is a wasteful number, since it uses less digits than its factorization.

42157768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170028 (or 170024 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 42157768 is about 6492.9013545564. The cubic root of 42157768 is about 348.0373633200.

The spelling of 42157768 in words is "forty-two million, one hundred fifty-seven thousand, seven hundred sixty-eight".