81773000 has 32 divisors (see below), whose sum is σ = 191351160. Its totient is φ = 32708800.

The previous prime is 81772991. The next prime is 81773023. The reversal of 81773000 is 37718.

It can be written as a sum of positive squares in 4 ways, for example, as 36264484 + 45508516 = 6022^2 + 6746^2 .

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, 39887 + ... + 41886.

Almost surely, 2^81773000 is an apocalyptic number.

It is an amenable number.

81773000 is an abundant number, since it is smaller than the sum of its proper divisors (109578160).

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

81773000 is a wasteful number, since it uses less digits than its factorization.

81773000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81794 (or 81780 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 81773000 is about 9042.8424734704. The cubic root of 81773000 is about 434.0468848667.

The spelling of 81773000 in words is "eighty-one million, seven hundred seventy-three thousand".