81367210 has 16 divisors (see below), whose sum is σ = 146608776. Its totient is φ = 32514048.

The previous prime is 81367163. The next prime is 81367211. The reversal of 81367210 is 1276318.

It can be written as a sum of positive squares in 4 ways, for example, as 80946009 + 421201 = 8997^2 + 649^2 .

It is not an unprimeable number, because it can be changed into a prime (81367211) 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, 8002 + ... + 15058.

Almost surely, 2^81367210 is an apocalyptic number.

81367210 is a deficient number, since it is larger than the sum of its proper divisors (65241566).

81367210 is a wasteful number, since it uses less digits than its factorization.

81367210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8217.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 81367210 is about 9020.3774865579. The cubic root of 81367210 is about 433.3277231358.

The spelling of 81367210 in words is "eighty-one million, three hundred sixty-seven thousand, two hundred ten".