649422078 has 16 divisors (see below), whose sum is σ = 1299095040. Its totient is φ = 216432216.

The previous prime is 649422073. The next prime is 649422079. The reversal of 649422078 is 870224946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649422073) 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, 50901 + ... + 62367.

It is an arithmetic number, because the mean of its divisors is an integer number (81193440).

Almost surely, 2^649422078 is an apocalyptic number.

649422078 is an abundant number, since it is smaller than the sum of its proper divisors (649672962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649422078 is a wasteful number, since it uses less digits than its factorization.

649422078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20911.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 649422078 is about 25483.7610646466. The cubic root of 649422078 is about 865.9823017111.

The spelling of 649422078 in words is "six hundred forty-nine million, four hundred twenty-two thousand, seventy-eight".