80021667 has 16 divisors (see below), whose sum is σ = 119104128. Its totient is φ = 47369280.

The previous prime is 80021657. The next prime is 80021671. The reversal of 80021667 is 76612008.

It is a happy number.

It is not a de Polignac number, because 80021667 - 2⁶ = 80021603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80021647) 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, 26778 + ... + 29615.

It is an arithmetic number, because the mean of its divisors is an integer number (7444008).

Almost surely, 2^80021667 is an apocalyptic number.

80021667 is a deficient number, since it is larger than the sum of its proper divisors (39082461).

80021667 is a wasteful number, since it uses less digits than its factorization.

80021667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56450.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 80021667 is about 8945.4830501209. The cubic root of 80021667 is about 430.9258346087.

It can be divided in two parts, 8002 and 1667, that added together give a palindrome (9669).

The spelling of 80021667 in words is "eighty million, twenty-one thousand, six hundred sixty-seven".