66912442 has 32 divisors (see below), whose sum is σ = 108972864. Its totient is φ = 30700800.

The previous prime is 66912437. The next prime is 66912463. The reversal of 66912442 is 24421966.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 66912398 and 66912407.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369592 + ... + 369772.

It is an arithmetic number, because the mean of its divisors is an integer number (3405402).

Almost surely, 2^66912442 is an apocalyptic number.

66912442 is a deficient number, since it is larger than the sum of its proper divisors (42060422).

66912442 is a wasteful number, since it uses less digits than its factorization.

66912442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414.

The product of its digits is 20736, while the sum is 34.

The square root of 66912442 is about 8180.0025672368. The cubic root of 66912442 is about 405.9778070327.

The spelling of 66912442 in words is "sixty-six million, nine hundred twelve thousand, four hundred forty-two".