5402400644 has 24 divisors (see below), whose sum is σ = 10054400160. Its totient is φ = 2532646656.

The previous prime is 5402400643. The next prime is 5402400733. The reversal of 5402400644 is 4460042045.

It is a happy number.

It is a super-2 number, since 2×5402400644² = 58371865436583229472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5402400643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359042 + ... + 373785.

It is an arithmetic number, because the mean of its divisors is an integer number (418933340).

Almost surely, 2^5402400644 is an apocalyptic number.

It is an amenable number.

5402400644 is a deficient number, since it is larger than the sum of its proper divisors (4651999516).

5402400644 is a wasteful number, since it uses less digits than its factorization.

5402400644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732947 (or 732945 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 5402400644 is about 73501.0247819716. The cubic root of 5402400644 is about 1754.6705868421.

Adding to 5402400644 its reverse (4460042045), we get a palindrome (9862442689).

The spelling of 5402400644 in words is "five billion, four hundred two million, four hundred thousand, six hundred forty-four".