80211978 has 128 divisors (see below), whose sum is σ = 225607680. Its totient is φ = 20520000.

The previous prime is 80211961. The next prime is 80211979. The reversal of 80211978 is 87911208.

It is a super-2 number, since 2×80211978² = 12867922829344968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80211979) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 419863 + ... + 420053.

It is an arithmetic number, because the mean of its divisors is an integer number (1762560).

Almost surely, 2^80211978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80211978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112803840).

80211978 is an abundant number, since it is smaller than the sum of its proper divisors (145395702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80211978 is a wasteful number, since it uses less digits than its factorization.

80211978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 80211978 is about 8956.1140010610. The cubic root of 80211978 is about 431.2671796559.

It can be divided in two parts, 8021 and 1978, that added together give a palindrome (9999).

The spelling of 80211978 in words is "eighty million, two hundred eleven thousand, nine hundred seventy-eight".