66672758 has 4 divisors (see below), whose sum is σ = 100009140. Its totient is φ = 33336378.

The previous prime is 66672737. The next prime is 66672787. The reversal of 66672758 is 85727666.

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

It is a super-3 number, since 3×66672758³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16668188 + ... + 16668191.

It is an arithmetic number, because the mean of its divisors is an integer number (25002285).

Almost surely, 2^66672758 is an apocalyptic number.

66672758 is a deficient number, since it is larger than the sum of its proper divisors (33336382).

66672758 is a wasteful number, since it uses less digits than its factorization.

66672758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33336381.

The product of its digits is 846720, while the sum is 47.

The square root of 66672758 is about 8165.3388172200. The cubic root of 66672758 is about 405.4924822354.

The spelling of 66672758 in words is "sixty-six million, six hundred seventy-two thousand, seven hundred fifty-eight".