81650276 has 12 divisors (see below), whose sum is σ = 149100672. Its totient is φ = 39050088.

The previous prime is 81650267. The next prime is 81650279. The reversal of 81650276 is 67205618.

It is not an unprimeable number, because it can be changed into a prime (81650279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443660 + ... + 443843.

It is an arithmetic number, because the mean of its divisors is an integer number (12425056).

Almost surely, 2^81650276 is an apocalyptic number.

It is an amenable number.

81650276 is a deficient number, since it is larger than the sum of its proper divisors (67450396).

81650276 is a wasteful number, since it uses less digits than its factorization.

81650276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887530 (or 887528 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 81650276 is about 9036.0542273716. The cubic root of 81650276 is about 433.8296385868.

The spelling of 81650276 in words is "eighty-one million, six hundred fifty thousand, two hundred seventy-six".