82531778 has 12 divisors (see below), whose sum is σ = 144009702. Its totient is φ = 35370720.

The previous prime is 82531777. The next prime is 82531783. The reversal of 82531778 is 87713528.

It can be written as a sum of positive squares in only one way, i.e., 81414529 + 1117249 = 9023^2 + 1057^2 .

It is a super-2 number, since 2×82531778² = 13622988759682568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82531777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 420983 + ... + 421178.

Almost surely, 2^82531778 is an apocalyptic number.

82531778 is a deficient number, since it is larger than the sum of its proper divisors (61477924).

82531778 is a wasteful number, since it uses less digits than its factorization.

82531778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842177 (or 842170 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 82531778 is about 9084.7002151970. The cubic root of 82531778 is about 435.3852719177.

The spelling of 82531778 in words is "eighty-two million, five hundred thirty-one thousand, seven hundred seventy-eight".