81926402 has 8 divisors (see below), whose sum is σ = 122954700. Its totient is φ = 40941504.

The previous prime is 81926401. The next prime is 81926407. The reversal of 81926402 is 20462918.

It can be written as a sum of positive squares in 2 ways, for example, as 56715961 + 25210441 = 7531^2 + 5021^2 .

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 (81926401) 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, 5627 + ... + 13982.

Almost surely, 2^81926402 is an apocalyptic number.

81926402 is a deficient number, since it is larger than the sum of its proper divisors (41028298).

81926402 is a wasteful number, since it uses less digits than its factorization.

81926402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21700.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 81926402 is about 9051.3204561544. The cubic root of 81926402 is about 434.3181319683.

It can be divided in two parts, 81926 and 402, that added together give a palindrome (82328).

The spelling of 81926402 in words is "eighty-one million, nine hundred twenty-six thousand, four hundred two".