42551690 has 8 divisors (see below), whose sum is σ = 76593060. Its totient is φ = 17020672.

The previous prime is 42551687. The next prime is 42551699. The reversal of 42551690 is 9615524.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42133081 + 418609 = 6491^2 + 647^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×42551690² = 3621292643712200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42551699) 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, 2127575 + ... + 2127594.

Almost surely, 2^42551690 is an apocalyptic number.

42551690 is a deficient number, since it is larger than the sum of its proper divisors (34041370).

42551690 is a wasteful number, since it uses less digits than its factorization.

42551690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255176.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 42551690 is about 6523.1656425389. The cubic root of 42551690 is about 349.1180242470.

The spelling of 42551690 in words is "forty-two million, five hundred fifty-one thousand, six hundred ninety".