64231540828 has 288 divisors, whose sum is σ = 154670530560. Its totient is φ = 23044331520.

The previous prime is 64231540777. The next prime is 64231540889. The reversal of 64231540828 is 82804513246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 190597876 + ... + 190598212.

Almost surely, 2^64231540828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64231540828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77335265280).

64231540828 is an abundant number, since it is smaller than the sum of its proper divisors (90438989732).

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

64231540828 is a wasteful number, since it uses less digits than its factorization.

64231540828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 64231540828 in words is "sixty-four billion, two hundred thirty-one million, five hundred forty thousand, eight hundred twenty-eight".