64723354398 has 60 divisors (see below), whose sum is σ = 147817308408. Its totient is φ = 21167237520.

The previous prime is 64723354373. The next prime is 64723354459. The reversal of 64723354398 is 89345332746.

64723354398 is a `hidden beast` number, since 6 + 4 + 7 + 2 + 3 + 3 + 543 + 98 = 666.

It is a super-2 number, since 2×64723354398² (a number of 22 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 383943 + ... + 526173.

Almost surely, 2^64723354398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64723354398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73908654204).

64723354398 is an abundant number, since it is smaller than the sum of its proper divisors (83093954010).

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

64723354398 is a wasteful number, since it uses less digits than its factorization.

64723354398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142351 (or 142289 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 54.

The spelling of 64723354398 in words is "sixty-four billion, seven hundred twenty-three million, three hundred fifty-four thousand, three hundred ninety-eight".