81612152 has 8 divisors (see below), whose sum is σ = 153022800. Its totient is φ = 40806072.

The previous prime is 81612143. The next prime is 81612161. The reversal of 81612152 is 25121618.

It is an interprime number because it is at equal distance from previous prime (81612143) and next prime (81612161).

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×81612152² = 13321086708142208, 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 as a sum of consecutive naturals, namely, 5100752 + ... + 5100767.

It is an arithmetic number, because the mean of its divisors is an integer number (19127850).

Almost surely, 2^81612152 is an apocalyptic number.

It is an amenable number.

81612152 is a deficient number, since it is larger than the sum of its proper divisors (71410648).

81612152 is a wasteful number, since it uses less digits than its factorization.

81612152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10201525 (or 10201521 counting only the distinct ones).

The product of its digits is 960, while the sum is 26.

The square root of 81612152 is about 9033.9444319743. The cubic root of 81612152 is about 433.7621070903.

The spelling of 81612152 in words is "eighty-one million, six hundred twelve thousand, one hundred fifty-two".