81504198 has 32 divisors (see below), whose sum is σ = 181530720. Its totient is φ = 27106560.

The previous prime is 81504191. The next prime is 81504217. The reversal of 81504198 is 89140518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81504191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26686 + ... + 29582.

It is an arithmetic number, because the mean of its divisors is an integer number (5672835).

Almost surely, 2^81504198 is an apocalyptic number.

81504198 is an abundant number, since it is smaller than the sum of its proper divisors (100026522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81504198 is a wasteful number, since it uses less digits than its factorization.

81504198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3429 (or 3423 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 81504198 is about 9027.9675453559. The cubic root of 81504198 is about 433.5707670535.

The spelling of 81504198 in words is "eighty-one million, five hundred four thousand, one hundred ninety-eight".