81893628 has 54 divisors (see below), whose sum is σ = 210016352. Its totient is φ = 26906400.

The previous prime is 81893621. The next prime is 81893653. The reversal of 81893628 is 82639818.

81893628 is a `hidden beast` number, since 8 + 18 + 9 + 3 + 628 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81893621) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 367125 + ... + 367347.

Almost surely, 2^81893628 is an apocalyptic number.

It is an amenable number.

81893628 is an abundant number, since it is smaller than the sum of its proper divisors (128122724).

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

81893628 is a wasteful number, since it uses less digits than its factorization.

81893628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 329 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 81893628 is about 9049.5098209793. The cubic root of 81893628 is about 434.2602090820.

The spelling of 81893628 in words is "eighty-one million, eight hundred ninety-three thousand, six hundred twenty-eight".