651649620 has 48 divisors (see below), whose sum is σ = 1829761920. Its totient is φ = 173283456.

The previous prime is 651649619. The next prime is 651649637. The reversal of 651649620 is 26946156.

651649620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×651649620² = 849294454492288800, which contains 22 as substring.

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, 6414 + ... + 36666.

It is an arithmetic number, because the mean of its divisors is an integer number (38120040).

Almost surely, 2^651649620 is an apocalyptic number.

651649620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

651649620 is an abundant number, since it is smaller than the sum of its proper divisors (1178112300).

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

651649620 is a wasteful number, since it uses less digits than its factorization.

651649620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30624 (or 30622 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 651649620 is about 25527.4287776893. The cubic root of 651649620 is about 866.9712890375.

The spelling of 651649620 in words is "six hundred fifty-one million, six hundred forty-nine thousand, six hundred twenty".