82400644 has 12 divisors (see below), whose sum is σ = 151790800. Its totient is φ = 39031848.

The previous prime is 82400641. The next prime is 82400671. The reversal of 82400644 is 44600428.

It is a super-2 number, since 2×82400644² = 13579732263229472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82400641) 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, 542034 + ... + 542185.

Almost surely, 2^82400644 is an apocalyptic number.

It is an amenable number.

82400644 is a deficient number, since it is larger than the sum of its proper divisors (69390156).

82400644 is a wasteful number, since it uses less digits than its factorization.

82400644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084242 (or 1084240 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 82400644 is about 9077.4800467971. The cubic root of 82400644 is about 435.1545564326.

The spelling of 82400644 in words is "eighty-two million, four hundred thousand, six hundred forty-four".