81425050 has 24 divisors (see below), whose sum is σ = 173087136. Its totient is φ = 27917040.

The previous prime is 81425021. The next prime is 81425059. The reversal of 81425050 is 5052418.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (81425059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115972 + ... + 116671.

It is an arithmetic number, because the mean of its divisors is an integer number (7211964).

Almost surely, 2^81425050 is an apocalyptic number.

81425050 is an abundant number, since it is smaller than the sum of its proper divisors (91662086).

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

81425050 is a wasteful number, since it uses less digits than its factorization.

81425050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232662 (or 232657 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 81425050 is about 9023.5829912513. The cubic root of 81425050 is about 433.4303760308.

Adding to 81425050 its reverse (5052418), we get a palindrome (86477468).

The spelling of 81425050 in words is "eighty-one million, four hundred twenty-five thousand, fifty".