651094638 has 32 divisors (see below), whose sum is σ = 1311399936. Its totient is φ = 215503008.

The previous prime is 651094627. The next prime is 651094651. The reversal of 651094638 is 836490156.

It is a self number, because there is not a number n which added to its sum of digits gives 651094638.

It is a congruent number.

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, 672831 + ... + 673797.

It is an arithmetic number, because the mean of its divisors is an integer number (40981248).

Almost surely, 2^651094638 is an apocalyptic number.

651094638 is an abundant number, since it is smaller than the sum of its proper divisors (660305298).

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

651094638 is a wasteful number, since it uses less digits than its factorization.

651094638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 651094638 is about 25516.5561547792. The cubic root of 651094638 is about 866.7250983944.

The spelling of 651094638 in words is "six hundred fifty-one million, ninety-four thousand, six hundred thirty-eight".