66928378 has 16 divisors (see below), whose sum is σ = 110841696. Its totient is φ = 30054640.

The previous prime is 66928333. The next prime is 66928387. The reversal of 66928378 is 87382966.

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, 16501 + ... + 20152.

It is an arithmetic number, because the mean of its divisors is an integer number (6927606).

Almost surely, 2^66928378 is an apocalyptic number.

66928378 is a deficient number, since it is larger than the sum of its proper divisors (43913318).

66928378 is a wasteful number, since it uses less digits than its factorization.

66928378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36749.

The product of its digits is 870912, while the sum is 49.

The square root of 66928378 is about 8180.9765920702. The cubic root of 66928378 is about 406.0100339678.

The spelling of 66928378 in words is "sixty-six million, nine hundred twenty-eight thousand, three hundred seventy-eight".