648220400 has 30 divisors (see below), whose sum is σ = 1557350472. Its totient is φ = 259288000.

The previous prime is 648220367. The next prime is 648220403. The reversal of 648220400 is 4022846.

It is a self number, because there is not a number n which added to its sum of digits gives 648220400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648220403) 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, 809876 + ... + 810675.

Almost surely, 2^648220400 is an apocalyptic number.

It is an amenable number.

648220400 is an abundant number, since it is smaller than the sum of its proper divisors (909130072).

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

648220400 is a wasteful number, since it uses less digits than its factorization.

648220400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620569 (or 1620558 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 648220400 is about 25460.1728195234. The cubic root of 648220400 is about 865.4478396454.

The spelling of 648220400 in words is "six hundred forty-eight million, two hundred twenty thousand, four hundred".