81862380 has 48 divisors (see below), whose sum is σ = 254684640. Its totient is φ = 21829824.

The previous prime is 81862367. The next prime is 81862399. The reversal of 81862380 is 8326818.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 75259 + ... + 76338.

It is an arithmetic number, because the mean of its divisors is an integer number (5305930).

Almost surely, 2^81862380 is an apocalyptic number.

It is an amenable number.

81862380 is an abundant number, since it is smaller than the sum of its proper divisors (172822260).

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

81862380 is a wasteful number, since it uses less digits than its factorization.

81862380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151615 (or 151607 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 81862380 is about 9047.7831539002. The cubic root of 81862380 is about 434.2049687675.

The spelling of 81862380 in words is "eighty-one million, eight hundred sixty-two thousand, three hundred eighty".