651386740 has 12 divisors (see below), whose sum is σ = 1367912196. Its totient is φ = 260554688.

The previous prime is 651386737. The next prime is 651386753. The reversal of 651386740 is 47683156.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 167650704 + 483736036 = 12948^2 + 21994^2 .

It is a super-3 number, since 3×651386740³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 651386693 and 651386702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16284649 + ... + 16284688.

It is an arithmetic number, because the mean of its divisors is an integer number (113992683).

Almost surely, 2^651386740 is an apocalyptic number.

It is an amenable number.

651386740 is an abundant number, since it is smaller than the sum of its proper divisors (716525456).

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

651386740 is a wasteful number, since it uses less digits than its factorization.

651386740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32569346 (or 32569344 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 651386740 is about 25522.2792869289. The cubic root of 651386740 is about 866.8546926033.

The spelling of 651386740 in words is "six hundred fifty-one million, three hundred eighty-six thousand, seven hundred forty".