81436502 has 16 divisors (see below), whose sum is σ = 140990112. Its totient is φ = 34555200.

The previous prime is 81436469. The next prime is 81436507. The reversal of 81436502 is 20563418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81436507) 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, 27383 + ... + 30210.

It is an arithmetic number, because the mean of its divisors is an integer number (8811882).

Almost surely, 2^81436502 is an apocalyptic number.

81436502 is a deficient number, since it is larger than the sum of its proper divisors (59553610).

81436502 is a wasteful number, since it uses less digits than its factorization.

81436502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57703.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 81436502 is about 9024.2175284065. The cubic root of 81436502 is about 433.4506949703.

The spelling of 81436502 in words is "eighty-one million, four hundred thirty-six thousand, five hundred two".