646742424 has 128 divisors (see below), whose sum is σ = 1771372800. Its totient is φ = 195993600.

The previous prime is 646742381. The next prime is 646742431. The reversal of 646742424 is 424247646.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1612624 + ... + 1613024.

It is an arithmetic number, because the mean of its divisors is an integer number (13838850).

Almost surely, 2^646742424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646742424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (885686400).

646742424 is an abundant number, since it is smaller than the sum of its proper divisors (1124630376).

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

646742424 is a wasteful number, since it uses less digits than its factorization.

646742424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 549 counting only the distinct ones).

The product of its digits is 258048, while the sum is 39.

The square root of 646742424 is about 25431.1310011962. The cubic root of 646742424 is about 864.7895838443.

The spelling of 646742424 in words is "six hundred forty-six million, seven hundred forty-two thousand, four hundred twenty-four".