81342480 has 40 divisors (see below), whose sum is σ = 252162432. Its totient is φ = 21691264.

The previous prime is 81342473. The next prime is 81342491. The reversal of 81342480 is 8424318.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169224 + ... + 169703.

Almost surely, 2^81342480 is an apocalyptic number.

81342480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81342480 is an abundant number, since it is smaller than the sum of its proper divisors (170819952).

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

81342480 is a wasteful number, since it uses less digits than its factorization.

81342480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338943 (or 338937 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 81342480 is about 9019.0065971813. The cubic root of 81342480 is about 433.2838181425.

Adding to 81342480 its reverse (8424318), we get a palindrome (89766798).

The spelling of 81342480 in words is "eighty-one million, three hundred forty-two thousand, four hundred eighty".