81002905274 has 8 divisors (see below), whose sum is σ = 121514798388. Its totient is φ = 40497972480.

The previous prime is 81002905273. The next prime is 81002905309. The reversal of 81002905274 is 47250920018.

It can be written as a sum of positive squares in 2 ways, for example, as 75781831225 + 5221074049 = 275285^2 + 72257^2 .

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

It is a super-2 number, since 2×81002905274² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81002905273) 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, 1710887 + ... + 1757594.

Almost surely, 2^81002905274 is an apocalyptic number.

81002905274 is a deficient number, since it is larger than the sum of its proper divisors (40511893114).

81002905274 is a wasteful number, since it uses less digits than its factorization.

81002905274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480160.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 81002905274 in words is "eighty-one billion, two million, nine hundred five thousand, two hundred seventy-four".