78211066 has 16 divisors (see below), whose sum is σ = 121502304. Its totient is φ = 37732464.

The previous prime is 78211039. The next prime is 78211069. The reversal of 78211066 is 66011287.

It is a super-2 number, since 2×78211066² = 12233941689712712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78211069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1660 + ... + 12616.

It is an arithmetic number, because the mean of its divisors is an integer number (7593894).

Almost surely, 2^78211066 is an apocalyptic number.

78211066 is a deficient number, since it is larger than the sum of its proper divisors (43291238).

78211066 is a wasteful number, since it uses less digits than its factorization.

78211066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11085.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 78211066 is about 8843.7020528736. The cubic root of 78211066 is about 427.6509112340.

The spelling of 78211066 in words is "seventy-eight million, two hundred eleven thousand, sixty-six".