81469652 has 24 divisors (see below), whose sum is σ = 156969120. Its totient is φ = 36689760.

The previous prime is 81469637. The next prime is 81469667. The reversal of 81469652 is 25696418.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81469637) and next prime (81469667).

It is a super-2 number, since 2×81469652² = 13274608394002208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3698 + ... + 13289.

It is an arithmetic number, because the mean of its divisors is an integer number (6540380).

Almost surely, 2^81469652 is an apocalyptic number.

It is an amenable number.

81469652 is a deficient number, since it is larger than the sum of its proper divisors (75499468).

81469652 is a wasteful number, since it uses less digits than its factorization.

81469652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17111 (or 17109 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 81469652 is about 9026.0540658695. The cubic root of 81469652 is about 433.5095012833.

The spelling of 81469652 in words is "eighty-one million, four hundred sixty-nine thousand, six hundred fifty-two".