81533662 has 16 divisors (see below), whose sum is σ = 139893120. Its totient is φ = 34912728.

The previous prime is 81533653. The next prime is 81533671. The reversal of 81533662 is 26633518.

It is an interprime number because it is at equal distance from previous prime (81533653) and next prime (81533671).

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, 23389 + ... + 26647.

It is an arithmetic number, because the mean of its divisors is an integer number (8743320).

Almost surely, 2^81533662 is an apocalyptic number.

81533662 is a deficient number, since it is larger than the sum of its proper divisors (58359458).

81533662 is a wasteful number, since it uses less digits than its factorization.

81533662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055.

The product of its digits is 25920, while the sum is 34.

The square root of 81533662 is about 9029.5992159121. The cubic root of 81533662 is about 433.6230064487.

The spelling of 81533662 in words is "eighty-one million, five hundred thirty-three thousand, six hundred sixty-two".