82787388 has 12 divisors (see below), whose sum is σ = 193170600. Its totient is φ = 27595792.

The previous prime is 82787387. The next prime is 82787401. The reversal of 82787388 is 88378728.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×82787388² = 13707503223725088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82787388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82787387) 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, 3449463 + ... + 3449486.

It is an arithmetic number, because the mean of its divisors is an integer number (16097550).

Almost surely, 2^82787388 is an apocalyptic number.

It is an amenable number.

82787388 is an abundant number, since it is smaller than the sum of its proper divisors (110383212).

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

82787388 is a wasteful number, since it uses less digits than its factorization.

82787388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6898956 (or 6898954 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 51.

The square root of 82787388 is about 9098.7574975927. The cubic root of 82787388 is about 435.8342873881.

The spelling of 82787388 in words is "eighty-two million, seven hundred eighty-seven thousand, three hundred eighty-eight".