66238870 has 16 divisors (see below), whose sum is σ = 121480560. Its totient is φ = 25995424.

The previous prime is 66238867. The next prime is 66238889. The reversal of 66238870 is 7883266.

It is a happy number.

It is a congruent 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, 61960 + ... + 63019.

It is an arithmetic number, because the mean of its divisors is an integer number (7592535).

Almost surely, 2^66238870 is an apocalyptic number.

66238870 is a deficient number, since it is larger than the sum of its proper divisors (55241690).

66238870 is a wasteful number, since it uses less digits than its factorization.

66238870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125039.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 66238870 is about 8138.7265588666. The cubic root of 66238870 is about 404.6109559767.

The spelling of 66238870 in words is "sixty-six million, two hundred thirty-eight thousand, eight hundred seventy".