81210374 has 16 divisors (see below), whose sum is σ = 139380000. Its totient is φ = 34763904.

The previous prime is 81210361. The next prime is 81210379. The reversal of 81210374 is 47301218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81210379) 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, 11252 + ... + 17000.

It is an arithmetic number, because the mean of its divisors is an integer number (8711250).

Almost surely, 2^81210374 is an apocalyptic number.

81210374 is a deficient number, since it is larger than the sum of its proper divisors (58169626).

81210374 is a wasteful number, since it uses less digits than its factorization.

81210374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6767.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 81210374 is about 9011.6798655966. The cubic root of 81210374 is about 433.0491297524.

The spelling of 81210374 in words is "eighty-one million, two hundred ten thousand, three hundred seventy-four".