81874628 has 24 divisors (see below), whose sum is σ = 156552480. Its totient is φ = 37157120.

The previous prime is 81874621. The next prime is 81874631. The reversal of 81874628 is 82647818.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (81874621) 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, 39875 + ... + 41877.

It is an arithmetic number, because the mean of its divisors is an integer number (6523020).

Almost surely, 2^81874628 is an apocalyptic number.

It is an amenable number.

81874628 is a deficient number, since it is larger than the sum of its proper divisors (74677852).

81874628 is a wasteful number, since it uses less digits than its factorization.

81874628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947 (or 2945 counting only the distinct ones).

The product of its digits is 172032, while the sum is 44.

The square root of 81874628 is about 9048.4599794661. The cubic root of 81874628 is about 434.2266224960.

The spelling of 81874628 in words is "eighty-one million, eight hundred seventy-four thousand, six hundred twenty-eight".