81025574 has 8 divisors (see below), whose sum is σ = 138901008. Its totient is φ = 34725240.

The previous prime is 81025559. The next prime is 81025577. The reversal of 81025574 is 47552018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×81025574⁴ (a number of 33 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81025574.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81025577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2893757 + ... + 2893784.

It is an arithmetic number, because the mean of its divisors is an integer number (17362626).

Almost surely, 2^81025574 is an apocalyptic number.

81025574 is a deficient number, since it is larger than the sum of its proper divisors (57875434).

81025574 is a wasteful number, since it uses less digits than its factorization.

81025574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5787550.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 81025574 is about 9001.4206656505. The cubic root of 81025574 is about 432.7204022149.

The spelling of 81025574 in words is "eighty-one million, twenty-five thousand, five hundred seventy-four".