646622748 has 18 divisors (see below), whose sum is σ = 1634518704. Its totient is φ = 215540904.

The previous prime is 646622747. The next prime is 646622749. The reversal of 646622748 is 847226646.

It is an interprime number because it is at equal distance from previous prime (646622747) and next prime (646622749).

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646622747) 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, 8980836 + ... + 8980907.

Almost surely, 2^646622748 is an apocalyptic number.

It is an amenable number.

646622748 is an abundant number, since it is smaller than the sum of its proper divisors (987895956).

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

646622748 is a wasteful number, since it uses less digits than its factorization.

646622748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17961753 (or 17961748 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The square root of 646622748 is about 25428.7779494021. Note that the first 3 decimals coincide. The cubic root of 646622748 is about 864.7362390924.

The spelling of 646622748 in words is "six hundred forty-six million, six hundred twenty-two thousand, seven hundred forty-eight".