6780478690 has 32 divisors (see below), whose sum is σ = 12639700080. Its totient is φ = 2615768064.

The previous prime is 6780478687. The next prime is 6780478709. The reversal of 6780478690 is 968740876.

It can be written as a sum of positive squares in 8 ways, for example, as 1954258849 + 4826219841 = 44207^2 + 69471^2 .

It is a super-2 number, since 2×6780478690² = 91949782531088232200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259254 + ... + 284206.

Almost surely, 2^6780478690 is an apocalyptic number.

6780478690 is a deficient number, since it is larger than the sum of its proper divisors (5859221390).

6780478690 is a wasteful number, since it uses less digits than its factorization.

6780478690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25926.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The square root of 6780478690 is about 82343.6621119076. The cubic root of 6780478690 is about 1892.7218037246.

The spelling of 6780478690 in words is "six billion, seven hundred eighty million, four hundred seventy-eight thousand, six hundred ninety".