81741628 has 6 divisors (see below), whose sum is σ = 143047856. Its totient is φ = 40870812.

The previous prime is 81741613. The next prime is 81741641. The reversal of 81741628 is 82614718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217700 + ... + 10217707.

Almost surely, 2^81741628 is an apocalyptic number.

It is an amenable number.

81741628 is a deficient number, since it is larger than the sum of its proper divisors (61306228).

81741628 is a wasteful number, since it uses less digits than its factorization.

81741628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20435411 (or 20435409 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 81741628 is about 9041.1076755008. The cubic root of 81741628 is about 433.9913707785.

It can be divided in two parts, 81741 and 628, that added together give a square (82369 = 287²).

The spelling of 81741628 in words is "eighty-one million, seven hundred forty-one thousand, six hundred twenty-eight".