651290640 has 320 divisors, whose sum is σ = 2711826432. Its totient is φ = 124876800.

The previous prime is 651290639. The next prime is 651290657. The reversal of 651290640 is 46092156.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 238885 + ... + 241595.

Almost surely, 2^651290640 is an apocalyptic number.

651290640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651290640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1355913216).

651290640 is an abundant number, since it is smaller than the sum of its proper divisors (2060535792).

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

651290640 is a wasteful number, since it uses less digits than its factorization.

651290640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758 (or 2752 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 651290640 is about 25520.3965486432. The cubic root of 651290640 is about 866.8120610770.

The spelling of 651290640 in words is "six hundred fifty-one million, two hundred ninety thousand, six hundred forty".