81492488 has 48 divisors (see below), whose sum is σ = 193914000. Its totient is φ = 31748640.

The previous prime is 81492469. The next prime is 81492491. The reversal of 81492488 is 88429418.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

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 11 ways as a sum of consecutive naturals, for example, 5138 + ... + 13761.

It is an arithmetic number, because the mean of its divisors is an integer number (4039875).

Almost surely, 2^81492488 is an apocalyptic number.

81492488 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81492488 is an abundant number, since it is smaller than the sum of its proper divisors (112421512).

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

81492488 is a wasteful number, since it uses less digits than its factorization.

81492488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18930 (or 18919 counting only the distinct ones).

The product of its digits is 147456, while the sum is 44.

The square root of 81492488 is about 9027.3189818462. The cubic root of 81492488 is about 433.5500018374.

The spelling of 81492488 in words is "eighty-one million, four hundred ninety-two thousand, four hundred eighty-eight".