81648152 has 8 divisors (see below), whose sum is σ = 153090300. Its totient is φ = 40824072.

The previous prime is 81648139. The next prime is 81648157. The reversal of 81648152 is 25184618.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81648157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5103002 + ... + 5103017.

Almost surely, 2^81648152 is an apocalyptic number.

It is an amenable number.

81648152 is a deficient number, since it is larger than the sum of its proper divisors (71442148).

81648152 is a wasteful number, since it uses less digits than its factorization.

81648152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206025 (or 10206021 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 81648152 is about 9035.9366974321. The cubic root of 81648152 is about 433.8258767619.

The spelling of 81648152 in words is "eighty-one million, six hundred forty-eight thousand, one hundred fifty-two".