81428053 has 24 divisors (see below), whose sum is σ = 100548000. Its totient is φ = 65566368.

The previous prime is 81428029. The next prime is 81428057. The reversal of 81428053 is 35082418.

It is not a de Polignac number, because 81428053 - 2²⁵ = 47873621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81428057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138426 + ... + 139012.

It is an arithmetic number, because the mean of its divisors is an integer number (4189500).

Almost surely, 2^81428053 is an apocalyptic number.

It is an amenable number.

81428053 is a deficient number, since it is larger than the sum of its proper divisors (19119947).

81428053 is a wasteful number, since it uses less digits than its factorization.

81428053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 81428053 is about 9023.7493870342. The cubic root of 81428053 is about 433.4357043477.

The spelling of 81428053 in words is "eighty-one million, four hundred twenty-eight thousand, fifty-three".