84450640 has 40 divisors (see below), whose sum is σ = 197317728. Its totient is φ = 33613440.

The previous prime is 84450637. The next prime is 84450643. The reversal of 84450640 is 4605448.

It is an interprime number because it is at equal distance from previous prime (84450637) and next prime (84450643).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84450643) 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, 14379 + ... + 19381.

Almost surely, 2^84450640 is an apocalyptic number.

84450640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84450640 is an abundant number, since it is smaller than the sum of its proper divisors (112867088).

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

84450640 is a wasteful number, since it uses less digits than its factorization.

84450640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5227 (or 5221 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 84450640 is about 9189.7029331747. The cubic root of 84450640 is about 438.7336868906.

The spelling of 84450640 in words is "eighty-four million, four hundred fifty thousand, six hundred forty".