6503978890 has 16 divisors (see below), whose sum is σ = 11714836320. Its totient is φ = 2599886160.

The previous prime is 6503978851. The next prime is 6503978903. The reversal of 6503978890 is 988793056.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197100 + ... + 227719.

It is an arithmetic number, because the mean of its divisors is an integer number (732177270).

Almost surely, 2^6503978890 is an apocalyptic number.

6503978890 is a deficient number, since it is larger than the sum of its proper divisors (5210857430).

6503978890 is a wasteful number, since it uses less digits than its factorization.

6503978890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426357.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The square root of 6503978890 is about 80647.2497361193. The cubic root of 6503978890 is about 1866.6363020500.

The spelling of 6503978890 in words is "six billion, five hundred three million, nine hundred seventy-eight thousand, eight hundred ninety".