651085890 has 128 divisors (see below), whose sum is σ = 2036482560. Its totient is φ = 129282048.

The previous prime is 651085871. The next prime is 651085921. The reversal of 651085890 is 98580156.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39396 + ... + 53424.

It is an arithmetic number, because the mean of its divisors is an integer number (15910020).

It is the magic constant of a 1092 × 1092 magic square.

Almost surely, 2^651085890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651085890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1018241280).

651085890 is an abundant number, since it is smaller than the sum of its proper divisors (1385396670).

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

651085890 is a wasteful number, since it uses less digits than its factorization.

651085890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14076.

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 651085890 is about 25516.3847360867. The cubic root of 651085890 is about 866.7212166519.

The spelling of 651085890 in words is "six hundred fifty-one million, eighty-five thousand, eight hundred ninety".