651350640 has 40 divisors (see below), whose sum is σ = 2019187728. Its totient is φ = 173693440.

The previous prime is 651350633. The next prime is 651350653. The reversal of 651350640 is 46053156.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 651350598 and 651350607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356741 + ... + 1357220.

Almost surely, 2^651350640 is an apocalyptic number.

651350640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

651350640 is an abundant number, since it is smaller than the sum of its proper divisors (1367837088).

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

651350640 is a wasteful number, since it uses less digits than its factorization.

651350640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713977 (or 2713971 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 651350640 is about 25521.5720518937. The cubic root of 651350640 is about 866.8386785467.

The spelling of 651350640 in words is "six hundred fifty-one million, three hundred fifty thousand, six hundred forty".