80778132 has 36 divisors (see below), whose sum is σ = 206781120. Its totient is φ = 26584272.

The previous prime is 80778127. The next prime is 80778133. The reversal of 80778132 is 23187708.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80778133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11358 + ... + 17045.

It is an arithmetic number, because the mean of its divisors is an integer number (5743920).

Almost surely, 2^80778132 is an apocalyptic number.

It is an amenable number.

80778132 is an abundant number, since it is smaller than the sum of its proper divisors (126002988).

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

80778132 is a wasteful number, since it uses less digits than its factorization.

80778132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28492 (or 28487 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 80778132 is about 8987.6655478495. The cubic root of 80778132 is about 432.2794616664.

The spelling of 80778132 in words is "eighty million, seven hundred seventy-eight thousand, one hundred thirty-two".