66742378 has 4 divisors (see below), whose sum is σ = 100113570. Its totient is φ = 33371188.

The previous prime is 66742373. The next prime is 66742387. The reversal of 66742378 is 87324766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 60326289 + 6416089 = 7767^2 + 2533^2 .

It is not an unprimeable number, because it can be changed into a prime (66742373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16685593 + ... + 16685596.

Almost surely, 2^66742378 is an apocalyptic number.

66742378 is a deficient number, since it is larger than the sum of its proper divisors (33371192).

66742378 is a wasteful number, since it uses less digits than its factorization.

66742378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33371191.

The product of its digits is 338688, while the sum is 43.

The square root of 66742378 is about 8169.6008470427. The cubic root of 66742378 is about 405.6335721750.

The spelling of 66742378 in words is "sixty-six million, seven hundred forty-two thousand, three hundred seventy-eight".