42487978 has 8 divisors (see below), whose sum is σ = 68634468. Its totient is φ = 19609824.

The previous prime is 42487943. The next prime is 42488003. The reversal of 42487978 is 87978424.

It can be written as a sum of positive squares in 2 ways, for example, as 39150049 + 3337929 = 6257^2 + 1827^2 .

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

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, 817051 + ... + 817102.

Almost surely, 2^42487978 is an apocalyptic number.

42487978 is a deficient number, since it is larger than the sum of its proper divisors (26146490).

42487978 is a wasteful number, since it uses less digits than its factorization.

42487978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634168.

The product of its digits is 903168, while the sum is 49.

The square root of 42487978 is about 6518.2802946790. The cubic root of 42487978 is about 348.9436941701.

The spelling of 42487978 in words is "forty-two million, four hundred eighty-seven thousand, nine hundred seventy-eight".