6405678388 has 12 divisors (see below), whose sum is σ = 11697325920. Its totient is φ = 3063585272.

The previous prime is 6405678379. The next prime is 6405678401. The reversal of 6405678388 is 8838765046.

It is a super-2 number, since 2×6405678388² = 82065431220980557088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34813378 + ... + 34813561.

It is an arithmetic number, because the mean of its divisors is an integer number (974777160).

Almost surely, 2^6405678388 is an apocalyptic number.

It is an amenable number.

6405678388 is a deficient number, since it is larger than the sum of its proper divisors (5291647532).

6405678388 is a wasteful number, since it uses less digits than its factorization.

6405678388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69626966 (or 69626964 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 55.

The square root of 6405678388 is about 80035.4820563980. The cubic root of 6405678388 is about 1857.1844699281.

The spelling of 6405678388 in words is "six billion, four hundred five million, six hundred seventy-eight thousand, three hundred eighty-eight".