649675026 has 384 divisors, whose sum is σ = 2109784320. Its totient is φ = 145152000.

The previous prime is 649675021. The next prime is 649675049. The reversal of 649675026 is 620576946.

It is not an unprimeable number, because it can be changed into a prime (649675021) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6432376 + ... + 6432476.

It is an arithmetic number, because the mean of its divisors is an integer number (5494230).

Almost surely, 2^649675026 is an apocalyptic number.

649675026 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 649675026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054892160).

649675026 is an abundant number, since it is smaller than the sum of its proper divisors (1460109294).

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

649675026 is a wasteful number, since it uses less digits than its factorization.

649675026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 649675026 is about 25488.7235066804. The cubic root of 649675026 is about 866.0947196415.

The spelling of 649675026 in words is "six hundred forty-nine million, six hundred seventy-five thousand, twenty-six".