81477418 has 16 divisors (see below), whose sum is σ = 133549056. Its totient is φ = 36973440.

The previous prime is 81477401. The next prime is 81477437.

81477418 is nontrivially palindromic in base 10.

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, 12055 + ... + 17557.

It is an arithmetic number, because the mean of its divisors is an integer number (8346816).

Almost surely, 2^81477418 is an apocalyptic number.

81477418 is a deficient number, since it is larger than the sum of its proper divisors (52071638).

81477418 is a wasteful number, since it uses less digits than its factorization.

81477418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6189.

The product of its digits is 50176, while the sum is 40.

The square root of 81477418 is about 9026.4842546808. The cubic root of 81477418 is about 433.5232754423.

The spelling of 81477418 in words is "eighty-one million, four hundred seventy-seven thousand, four hundred eighteen".