66690834 has 16 divisors (see below), whose sum is σ = 152436288. Its totient is φ = 19054512.

The previous prime is 66690781. The next prime is 66690859. The reversal of 66690834 is 43809666.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1587877 = 66690834 / (6 + 6 + 6 + 9 + 0 + 8 + 3 + 4).

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, 793897 + ... + 793980.

It is an arithmetic number, because the mean of its divisors is an integer number (9527268).

Almost surely, 2^66690834 is an apocalyptic number.

66690834 is an abundant number, since it is smaller than the sum of its proper divisors (85745454).

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

66690834 is a wasteful number, since it uses less digits than its factorization.

66690834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587889.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 66690834 is about 8166.4456160560. The cubic root of 66690834 is about 405.5291239865.

It can be divided in two parts, 66 and 690834, that added together give a triangular number (690900 = T₁₁₇₅).

The spelling of 66690834 in words is "sixty-six million, six hundred ninety thousand, eight hundred thirty-four".