651000400 has 30 divisors (see below), whose sum is σ = 1564029422. Its totient is φ = 260400000.

The previous prime is 651000373. The next prime is 651000433. The reversal of 651000400 is 4000156.

651000400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 121264144 + 529736256 = 11012^2 + 23016^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 813351 + ... + 814150.

Almost surely, 2^651000400 is an apocalyptic number.

It is an amenable number.

651000400 is an abundant number, since it is smaller than the sum of its proper divisors (913029022).

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

651000400 is a wasteful number, since it uses less digits than its factorization.

651000400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627519 (or 1627508 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 651000400 is about 25514.7094829630. The cubic root of 651000400 is about 866.6832804179.

Adding to 651000400 its reverse (4000156), we get a palindrome (655000556).

The spelling of 651000400 in words is "six hundred fifty-one million, four hundred", and thus it is an aban number.