64821445398 has 40 divisors (see below), whose sum is σ = 145270770480. Its totient is φ = 21603769200.

The previous prime is 64821445393. The next prime is 64821445463. The reversal of 64821445398 is 89354412846.

64821445398 is a `hidden beast` number, since 6 + 48 + 21 + 44 + 539 + 8 = 666.

64821445398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64821445391) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1143423 + ... + 1198773.

It is an arithmetic number, because the mean of its divisors is an integer number (3631769262).

Almost surely, 2^64821445398 is an apocalyptic number.

64821445398 is an abundant number, since it is smaller than the sum of its proper divisors (80449325082).

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

64821445398 is a wasteful number, since it uses less digits than its factorization.

64821445398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62594 (or 62585 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 54.

The spelling of 64821445398 in words is "sixty-four billion, eight hundred twenty-one million, four hundred forty-five thousand, three hundred ninety-eight".