64139879754 has 64 divisors (see below), whose sum is σ = 145207728000. Its totient is φ = 20980056960.

The previous prime is 64139879743. The next prime is 64139879761. The reversal of 64139879754 is 45797893146.

64139879754 is a `hidden beast` number, since 6 + 413 + 9 + 87 + 97 + 54 = 666.

It is a super-2 number, since 2×64139879754² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64139879691 and 64139879700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1795144 + ... + 1830524.

It is an arithmetic number, because the mean of its divisors is an integer number (2268870750).

Almost surely, 2^64139879754 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64139879754, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72603864000).

64139879754 is an abundant number, since it is smaller than the sum of its proper divisors (81067848246).

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

64139879754 is a wasteful number, since it uses less digits than its factorization.

64139879754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36020 (or 36014 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 64139879754 in words is "sixty-four billion, one hundred thirty-nine million, eight hundred seventy-nine thousand, seven hundred fifty-four".