81896370 has 32 divisors (see below), whose sum is σ = 199324800. Its totient is φ = 21530880.

The previous prime is 81896369. The next prime is 81896371. The reversal of 81896370 is 7369818.

It is an interprime number because it is at equal distance from previous prime (81896369) and next prime (81896371).

It is not an unprimeable number, because it can be changed into a prime (81896371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17095 + ... + 21354.

It is an arithmetic number, because the mean of its divisors is an integer number (6228900).

Almost surely, 2^81896370 is an apocalyptic number.

81896370 is an abundant number, since it is smaller than the sum of its proper divisors (117428430).

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

81896370 is a wasteful number, since it uses less digits than its factorization.

81896370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38530.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 81896370 is about 9049.6613196296. The cubic root of 81896370 is about 434.2650557278.

It can be divided in two parts, 8 and 1896370, that added together give a triangular number (1896378 = T₁₉₄₇).

The spelling of 81896370 in words is "eighty-one million, eight hundred ninety-six thousand, three hundred seventy".