219428066 has 32 divisors (see below), whose sum is σ = 389321856. Its totient is φ = 91440000.

The previous prime is 219428063. The next prime is 219428081. The reversal of 219428066 is 660824912.

It is a super-2 number, since 2×219428066² = 96297352297000712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (219428063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40646 + ... + 45726.

It is an arithmetic number, because the mean of its divisors is an integer number (12166308).

Almost surely, 2^219428066 is an apocalyptic number.

219428066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

219428066 is a deficient number, since it is larger than the sum of its proper divisors (169893790).

219428066 is a wasteful number, since it uses less digits than its factorization.

219428066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 219428066 is about 14813.1045361869. The cubic root of 219428066 is about 603.1574898012.

The spelling of 219428066 in words is "two hundred nineteen million, four hundred twenty-eight thousand, sixty-six".