649077392878 has 8 divisors (see below), whose sum is σ = 989577009000. Its totient is φ = 319218389880.

The previous prime is 649077392863. The next prime is 649077392923. The reversal of 649077392878 is 878293770946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 2660153128 + ... + 2660153371.

It is an arithmetic number, because the mean of its divisors is an integer number (123697126125).

Almost surely, 2^649077392878 is an apocalyptic number.

649077392878 is a deficient number, since it is larger than the sum of its proper divisors (340499616122).

649077392878 is a wasteful number, since it uses less digits than its factorization.

649077392878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5320306562.

The product of its (nonzero) digits is 256048128, while the sum is 70.

The spelling of 649077392878 in words is "six hundred forty-nine billion, seventy-seven million, three hundred ninety-two thousand, eight hundred seventy-eight".