87378444 has 18 divisors (see below), whose sum is σ = 220873380. Its totient is φ = 29126136.

The previous prime is 87378439. The next prime is 87378481. The reversal of 87378444 is 44487378.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×87378444² = 15269984951722272, 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 87378444.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1213554 + ... + 1213625.

Almost surely, 2^87378444 is an apocalyptic number.

It is an amenable number.

87378444 is an abundant number, since it is smaller than the sum of its proper divisors (133494936).

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

87378444 is a wasteful number, since it uses less digits than its factorization.

87378444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427189 (or 2427184 counting only the distinct ones).

The product of its digits is 602112, while the sum is 45.

The square root of 87378444 is about 9347.6437672817. The cubic root of 87378444 is about 443.7463245348.

The spelling of 87378444 in words is "eighty-seven million, three hundred seventy-eight thousand, four hundred forty-four".