81773492 has 24 divisors (see below), whose sum is σ = 151116000. Its totient is φ = 38611296.

The previous prime is 81773479. The next prime is 81773501. The reversal of 81773492 is 29437718.

It is a congruent number.

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, 24983 + ... + 28065.

It is an arithmetic number, because the mean of its divisors is an integer number (6296500).

Almost surely, 2^81773492 is an apocalyptic number.

It is an amenable number.

81773492 is a deficient number, since it is larger than the sum of its proper divisors (69342508).

81773492 is a wasteful number, since it uses less digits than its factorization.

81773492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3455 (or 3453 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 81773492 is about 9042.8696772651. The cubic root of 81773492 is about 434.0477553685.

The spelling of 81773492 in words is "eighty-one million, seven hundred seventy-three thousand, four hundred ninety-two".