81224404 has 12 divisors (see below), whose sum is σ = 142223200. Its totient is φ = 40589208.

The previous prime is 81224387. The next prime is 81224417. The reversal of 81224404 is 40442218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4057 + ... + 13375.

Almost surely, 2^81224404 is an apocalyptic number.

It is an amenable number.

81224404 is a deficient number, since it is larger than the sum of its proper divisors (60998796).

81224404 is a wasteful number, since it uses less digits than its factorization.

81224404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11502 (or 11500 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 81224404 is about 9012.4582662002. The cubic root of 81224404 is about 433.0740663426.

The spelling of 81224404 in words is "eighty-one million, two hundred twenty-four thousand, four hundred four".