651890820 has 48 divisors (see below), whose sum is σ = 2086051968. Its totient is φ = 149003520.

The previous prime is 651890819. The next prime is 651890821. The reversal of 651890820 is 28098156.

It is an interprime number because it is at equal distance from previous prime (651890819) and next prime (651890821).

It is not an unprimeable number, because it can be changed into a prime (651890821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 775641 + ... + 776480.

It is an arithmetic number, because the mean of its divisors is an integer number (43459416).

Almost surely, 2^651890820 is an apocalyptic number.

651890820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

651890820 is an abundant number, since it is smaller than the sum of its proper divisors (1434161148).

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

651890820 is a wasteful number, since it uses less digits than its factorization.

651890820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552140 (or 1552138 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 651890820 is about 25532.1526707013. The cubic root of 651890820 is about 867.0782420552.

The spelling of 651890820 in words is "six hundred fifty-one million, eight hundred ninety thousand, eight hundred twenty".