82640388 has 48 divisors (see below), whose sum is σ = 198968000. Its totient is φ = 26676864.

The previous prime is 82640387. The next prime is 82640423. The reversal of 82640388 is 88304628.

It is not an unprimeable number, because it can be changed into a prime (82640381) 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, 165363 + ... + 165861.

Almost surely, 2^82640388 is an apocalyptic number.

It is an amenable number.

82640388 is an abundant number, since it is smaller than the sum of its proper divisors (116327612).

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

82640388 is a wasteful number, since it uses less digits than its factorization.

82640388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916 (or 914 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 82640388 is about 9090.6758824633. The cubic root of 82640388 is about 435.5761740070.

It can be divided in two parts, 82640 and 388, that added together give a triangular number (83028 = T₄₀₇).

The spelling of 82640388 in words is "eighty-two million, six hundred forty thousand, three hundred eighty-eight".