82971790 has 16 divisors (see below), whose sum is σ = 162926640. Its totient is φ = 30171520.

The previous prime is 82971769. The next prime is 82971793. The reversal of 82971790 is 9717928.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82971793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377035 + ... + 377254.

It is an arithmetic number, because the mean of its divisors is an integer number (10182915).

Almost surely, 2^82971790 is an apocalyptic number.

82971790 is a deficient number, since it is larger than the sum of its proper divisors (79954850).

82971790 is a wasteful number, since it uses less digits than its factorization.

82971790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754307.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 82971790 is about 9108.8852226823. The cubic root of 82971790 is about 436.1576422630.

The spelling of 82971790 in words is "eighty-two million, nine hundred seventy-one thousand, seven hundred ninety".