81053868 has 24 divisors (see below), whose sum is σ = 216143872. Its totient is φ = 23158224.

The previous prime is 81053851. The next prime is 81053881. The reversal of 81053868 is 86835018.

It is a happy number.

It is a super-2 number, since 2×81053868² = 13139459035522848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482380 + ... + 482547.

Almost surely, 2^81053868 is an apocalyptic number.

It is an amenable number.

81053868 is an abundant number, since it is smaller than the sum of its proper divisors (135090004).

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

81053868 is a wasteful number, since it uses less digits than its factorization.

81053868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964941 (or 964939 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 81053868 is about 9002.9921692735. The cubic root of 81053868 is about 432.7707647758.

The spelling of 81053868 in words is "eighty-one million, fifty-three thousand, eight hundred sixty-eight".