66742890 has 16 divisors (see below), whose sum is σ = 160183008. Its totient is φ = 17798096.

The previous prime is 66742889. The next prime is 66742927. The reversal of 66742890 is 9824766.

It is a super-2 number, since 2×66742890² = 8909226731104200, which contains 22 as substring.

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, 1112352 + ... + 1112411.

It is an arithmetic number, because the mean of its divisors is an integer number (10011438).

Almost surely, 2^66742890 is an apocalyptic number.

66742890 is an abundant number, since it is smaller than the sum of its proper divisors (93440118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66742890 is a wasteful number, since it uses less digits than its factorization.

66742890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224773.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 66742890 is about 8169.6321826628. The cubic root of 66742890 is about 405.6346094164.

The spelling of 66742890 in words is "sixty-six million, seven hundred forty-two thousand, eight hundred ninety".