690138400 has 72 divisors (see below), whose sum is σ = 1925501760. Its totient is φ = 236616960.

The previous prime is 690138377. The next prime is 690138439. The reversal of 690138400 is 4831096.

It is a super-2 number, since 2×690138400² = 952582022309120000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56020 + ... + 67219.

It is an arithmetic number, because the mean of its divisors is an integer number (26743080).

Almost surely, 2^690138400 is an apocalyptic number.

It is an amenable number.

690138400 is an abundant number, since it is smaller than the sum of its proper divisors (1235363360).

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

690138400 is a wasteful number, since it uses less digits than its factorization.

690138400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123266 (or 123253 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 690138400 is about 26270.4853400161. The cubic root of 690138400 is about 883.7146694182.

Adding to 690138400 its reverse (4831096), we get a palindrome (694969496).

The spelling of 690138400 in words is "six hundred ninety million, one hundred thirty-eight thousand, four hundred".