331881840 has 80 divisors (see below), whose sum is σ = 1143156000. Its totient is φ = 88501248.

The previous prime is 331881787. The next prime is 331881883. The reversal of 331881840 is 48188133.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×331881840² = 220291111443571200, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 331881795 and 331881804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74665 + ... + 78984.

It is an arithmetic number, because the mean of its divisors is an integer number (14289450).

Almost surely, 2^331881840 is an apocalyptic number.

331881840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

331881840 is an abundant number, since it is smaller than the sum of its proper divisors (811274160).

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

331881840 is a wasteful number, since it uses less digits than its factorization.

331881840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153671 (or 153659 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 331881840 is about 18217.6244334985. The cubic root of 331881840 is about 692.3534007428.

It can be divided in two parts, 3318 and 81840, that added together give a palindrome (85158).

The spelling of 331881840 in words is "three hundred thirty-one million, eight hundred eighty-one thousand, eight hundred forty".