64261235280 has 160 divisors (see below), whose sum is σ = 217543397760. Its totient is φ = 15562455040.

The previous prime is 64261235279. The next prime is 64261235287. The reversal of 64261235280 is 8253216246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64261235287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2662306 + ... + 2686334.

It is an arithmetic number, because the mean of its divisors is an integer number (1359646236).

Almost surely, 2^64261235280 is an apocalyptic number.

64261235280 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 64261235280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108771698880).

64261235280 is an abundant number, since it is smaller than the sum of its proper divisors (153282162480).

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

64261235280 is a wasteful number, since it uses less digits than its factorization.

64261235280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25069 (or 25063 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 64261235280 in words is "sixty-four billion, two hundred sixty-one million, two hundred thirty-five thousand, two hundred eighty".