81948758 has 8 divisors (see below), whose sum is σ = 125006760. Its totient is φ = 40279840.

The previous prime is 81948749. The next prime is 81948781. The reversal of 81948758 is 85784918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347123 + ... + 347358.

It is an arithmetic number, because the mean of its divisors is an integer number (15625845).

Almost surely, 2^81948758 is an apocalyptic number.

81948758 is a deficient number, since it is larger than the sum of its proper divisors (43058002).

81948758 is a wasteful number, since it uses less digits than its factorization.

81948758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694542.

The product of its digits is 645120, while the sum is 50.

The square root of 81948758 is about 9052.5553298502. Note that the first 3 decimals coincide. The cubic root of 81948758 is about 434.3576338174.

The spelling of 81948758 in words is "eighty-one million, nine hundred forty-eight thousand, seven hundred fifty-eight".