81746402 has 8 divisors (see below), whose sum is σ = 122765916. Its totient is φ = 40824432.

The previous prime is 81746377. The next prime is 81746407. The reversal of 81746402 is 20464718.

It can be written as a sum of positive squares in 2 ways, for example, as 63504961 + 18241441 = 7969^2 + 4271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81746407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22253 + ... + 25664.

Almost surely, 2^81746402 is an apocalyptic number.

81746402 is a deficient number, since it is larger than the sum of its proper divisors (41019514).

81746402 is a wasteful number, since it uses less digits than its factorization.

81746402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48772.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 81746402 is about 9041.3716879686. The cubic root of 81746402 is about 433.9998194907. Note that the first 3 decimals are identical.

The spelling of 81746402 in words is "eighty-one million, seven hundred forty-six thousand, four hundred two".