82091772 has 48 divisors (see below), whose sum is σ = 243237120. Its totient is φ = 23454576.

The previous prime is 82091743. The next prime is 82091777. The reversal of 82091772 is 27719028.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82091777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53538 + ... + 55049.

It is an arithmetic number, because the mean of its divisors is an integer number (5067440).

Almost surely, 2^82091772 is an apocalyptic number.

It is an amenable number.

82091772 is an abundant number, since it is smaller than the sum of its proper divisors (161145348).

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

82091772 is a wasteful number, since it uses less digits than its factorization.

82091772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108607 (or 108599 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 82091772 is about 9060.4509821532. The cubic root of 82091772 is about 434.6101620358.

The spelling of 82091772 in words is "eighty-two million, ninety-one thousand, seven hundred seventy-two".