66420758 has 4 divisors (see below), whose sum is σ = 99631140. Its totient is φ = 33210378.

The previous prime is 66420737. The next prime is 66420769. The reversal of 66420758 is 85702466.

It is a happy number.

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

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, 16605188 + ... + 16605191.

It is an arithmetic number, because the mean of its divisors is an integer number (24907785).

Almost surely, 2^66420758 is an apocalyptic number.

66420758 is a deficient number, since it is larger than the sum of its proper divisors (33210382).

66420758 is a wasteful number, since it uses less digits than its factorization.

66420758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33210381.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 66420758 is about 8149.8931281336. The cubic root of 66420758 is about 404.9809633891.

The spelling of 66420758 in words is "sixty-six million, four hundred twenty thousand, seven hundred fifty-eight".