81007848 has 24 divisors (see below), whose sum is σ = 219396450. Its totient is φ = 27002592.

The previous prime is 81007831. The next prime is 81007853. The reversal of 81007848 is 84870018.

It can be written as a sum of positive squares in only one way, i.e., 53319204 + 27688644 = 7302^2 + 5262^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×81007848² = 13124542875182208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 562483 + ... + 562626.

Almost surely, 2^81007848 is an apocalyptic number.

It is an amenable number.

81007848 is an abundant number, since it is smaller than the sum of its proper divisors (138388602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81007848 is a wasteful number, since it uses less digits than its factorization.

81007848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125121 (or 1125114 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 81007848 is about 9000.4359894396. The cubic root of 81007848 is about 432.6888444368.

The spelling of 81007848 in words is "eighty-one million, seven thousand, eight hundred forty-eight".