2628400538 has 4 divisors (see below), whose sum is σ = 3942600810. Its totient is φ = 1314200268.

The previous prime is 2628400531. The next prime is 2628400559. The reversal of 2628400538 is 8350048262.

2628400538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2424282169 + 204118369 = 49237^2 + 14287^2 .

It is not an unprimeable number, because it can be changed into a prime (2628400531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657100133 + ... + 657100136.

Almost surely, 2^2628400538 is an apocalyptic number.

2628400538 is a deficient number, since it is larger than the sum of its proper divisors (1314200272).

2628400538 is a wasteful number, since it uses less digits than its factorization.

2628400538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314200271.

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 2628400538 is about 51267.9289419809. The cubic root of 2628400538 is about 1380.0575026799.

The spelling of 2628400538 in words is "two billion, six hundred twenty-eight million, four hundred thousand, five hundred thirty-eight".