81477092 has 24 divisors (see below), whose sum is σ = 152339040. Its totient is φ = 38016000.

The previous prime is 81477091. The next prime is 81477101. The reversal of 81477092 is 29077418.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (81477091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2909 + ... + 13092.

It is an arithmetic number, because the mean of its divisors is an integer number (6347460).

Almost surely, 2^81477092 is an apocalyptic number.

It is an amenable number.

81477092 is a deficient number, since it is larger than the sum of its proper divisors (70861948).

81477092 is a wasteful number, since it uses less digits than its factorization.

81477092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16091 (or 16089 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 81477092 is about 9026.4661966907. The cubic root of 81477092 is about 433.5226972503.

The spelling of 81477092 in words is "eighty-one million, four hundred seventy-seven thousand, ninety-two".