80019890 has 32 divisors (see below), whose sum is σ = 146880000. Its totient is φ = 31382208.

The previous prime is 80019881. The next prime is 80019893. The reversal of 80019890 is 9891008.

It is a happy number.

It is a super-2 number, since 2×80019890² = 12806365591224200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 80019890.

It is not an unprimeable number, because it can be changed into a prime (80019893) 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, 156956 + ... + 157464.

It is an arithmetic number, because the mean of its divisors is an integer number (4590000).

Almost surely, 2^80019890 is an apocalyptic number.

80019890 is a deficient number, since it is larger than the sum of its proper divisors (66860110).

80019890 is a wasteful number, since it uses less digits than its factorization.

80019890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 80019890 is about 8945.3837256990. The cubic root of 80019890 is about 430.9226448023.

The spelling of 80019890 in words is "eighty million, nineteen thousand, eight hundred ninety".