81448758 has 12 divisors (see below), whose sum is σ = 176472348. Its totient is φ = 27149580.

The previous prime is 81448753. The next prime is 81448769. The reversal of 81448758 is 85784418.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81448753) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2262448 + ... + 2262483.

It is an arithmetic number, because the mean of its divisors is an integer number (14706029).

Almost surely, 2^81448758 is an apocalyptic number.

81448758 is an abundant number, since it is smaller than the sum of its proper divisors (95023590).

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

81448758 is a wasteful number, since it uses less digits than its factorization.

81448758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4524939 (or 4524936 counting only the distinct ones).

The product of its digits is 286720, while the sum is 45.

The square root of 81448758 is about 9024.8965645042. The cubic root of 81448758 is about 433.4724383127.

The spelling of 81448758 in words is "eighty-one million, four hundred forty-eight thousand, seven hundred fifty-eight".