81867270 has 32 divisors (see below), whose sum is σ = 201053952. Its totient is φ = 21323232.

The previous prime is 81867259. The next prime is 81867287. The reversal of 81867270 is 7276818.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30442 + ... + 33021.

It is an arithmetic number, because the mean of its divisors is an integer number (6282936).

Almost surely, 2^81867270 is an apocalyptic number.

81867270 is an abundant number, since it is smaller than the sum of its proper divisors (119186682).

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

81867270 is a wasteful number, since it uses less digits than its factorization.

81867270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63516.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 81867270 is about 9048.0533818054. The cubic root of 81867270 is about 434.2136142528.

It can be divided in two parts, 8 and 1867270, that added together give a triangular number (1867278 = T₁₉₃₂).

The spelling of 81867270 in words is "eighty-one million, eight hundred sixty-seven thousand, two hundred seventy".