42688490 has 16 divisors (see below), whose sum is σ = 82750248. Its totient is φ = 15761856.

The previous prime is 42688487. The next prime is 42688501. The reversal of 42688490 is 9488624.

It can be written as a sum of positive squares in 4 ways, for example, as 19811401 + 22877089 = 4451^2 + 4783^2 .

It is a super-3 number, since 3×42688490³ (a number of 24 digits) contains 333 as substring.

It is a Curzon 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, 164057 + ... + 164316.

Almost surely, 2^42688490 is an apocalyptic number.

42688490 is a deficient number, since it is larger than the sum of its proper divisors (40061758).

42688490 is a wasteful number, since it uses less digits than its factorization.

42688490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328393.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 42688490 is about 6533.6429348412. The cubic root of 42688490 is about 349.4917521077.

The spelling of 42688490 in words is "forty-two million, six hundred eighty-eight thousand, four hundred ninety".