81350370 has 48 divisors (see below), whose sum is σ = 212015232. Its totient is φ = 21641760.

The previous prime is 81350359. The next prime is 81350429. The reversal of 81350370 is 7305318.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50599 + ... + 52181.

It is an arithmetic number, because the mean of its divisors is an integer number (4416984).

Almost surely, 2^81350370 is an apocalyptic number.

81350370 is an abundant number, since it is smaller than the sum of its proper divisors (130664862).

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

81350370 is a wasteful number, since it uses less digits than its factorization.

81350370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167 (or 2164 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 81350370 is about 9019.4439961674. The cubic root of 81350370 is about 433.2978268080.

Adding to 81350370 its reverse (7305318), we get a palindrome (88655688).

The spelling of 81350370 in words is "eighty-one million, three hundred fifty thousand, three hundred seventy".