651156440 has 128 divisors (see below), whose sum is σ = 1703877120. Its totient is φ = 221337600.

The previous prime is 651156437. The next prime is 651156469. The reversal of 651156440 is 44651156.

It is a junction number, because it is equal to n+sod(n) for n = 651156397 and 651156406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1967075 + ... + 1967405.

It is an arithmetic number, because the mean of its divisors is an integer number (13311540).

Almost surely, 2^651156440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651156440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851938560).

651156440 is an abundant number, since it is smaller than the sum of its proper divisors (1052720680).

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

651156440 is a wasteful number, since it uses less digits than its factorization.

651156440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 651156440 is about 25517.7671436981. The cubic root of 651156440 is about 866.7525207519.

The spelling of 651156440 in words is "six hundred fifty-one million, one hundred fifty-six thousand, four hundred forty".