64227155640 has 128 divisors (see below), whose sum is σ = 195147532800. Its totient is φ = 16909171200.

The previous prime is 64227155639. The next prime is 64227155659. The reversal of 64227155640 is 4655172246.

It is a junction number, because it is equal to n+sod(n) for n = 64227155592 and 64227155601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3692965 + ... + 3710315.

It is an arithmetic number, because the mean of its divisors is an integer number (1524590100).

Almost surely, 2^64227155640 is an apocalyptic number.

64227155640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64227155640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97573766400).

64227155640 is an abundant number, since it is smaller than the sum of its proper divisors (130920377160).

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

64227155640 is a wasteful number, since it uses less digits than its factorization.

64227155640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17757 (or 17753 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 64227155640 in words is "sixty-four billion, two hundred twenty-seven million, one hundred fifty-five thousand, six hundred forty".