81469770 has 32 divisors (see below), whose sum is σ = 198737280. Its totient is φ = 21368640.

The previous prime is 81469741. The next prime is 81469783. The reversal of 81469770 is 7796418.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20430 + ... + 24089.

It is an arithmetic number, because the mean of its divisors is an integer number (6210540).

Almost surely, 2^81469770 is an apocalyptic number.

81469770 is an abundant number, since it is smaller than the sum of its proper divisors (117267510).

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

81469770 is a wasteful number, since it uses less digits than its factorization.

81469770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44590.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 81469770 is about 9026.0606024999. The cubic root of 81469770 is about 433.5097105804.

The spelling of 81469770 in words is "eighty-one million, four hundred sixty-nine thousand, seven hundred seventy".