81473416 has 8 divisors (see below), whose sum is σ = 152762670. Its totient is φ = 40736704.

The previous prime is 81473393. The next prime is 81473417. The reversal of 81473416 is 61437418.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 57912100 + 23561316 = 7610^2 + 4854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (81473417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5092081 + ... + 5092096.

Almost surely, 2^81473416 is an apocalyptic number.

It is an amenable number.

81473416 is a deficient number, since it is larger than the sum of its proper divisors (71289254).

81473416 is a wasteful number, since it uses less digits than its factorization.

81473416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10184183 (or 10184179 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 81473416 is about 9026.2625709648. The cubic root of 81473416 is about 433.5161774078.

The spelling of 81473416 in words is "eighty-one million, four hundred seventy-three thousand, four hundred sixteen".