642280650 has 96 divisors (see below), whose sum is σ = 1756012608. Its totient is φ = 154060800.

The previous prime is 642280609. The next prime is 642280663. The reversal of 642280650 is 56082246.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 158044 + ... + 162056.

It is an arithmetic number, because the mean of its divisors is an integer number (18291798).

Almost surely, 2^642280650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642280650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (878006304).

642280650 is an abundant number, since it is smaller than the sum of its proper divisors (1113731958).

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

642280650 is a wasteful number, since it uses less digits than its factorization.

642280650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4136 (or 4131 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 642280650 is about 25343.2564995109. The cubic root of 642280650 is about 862.7963107096.

The spelling of 642280650 in words is "six hundred forty-two million, two hundred eighty thousand, six hundred fifty".