64329540 has 96 divisors (see below), whose sum is σ = 203333760. Its totient is φ = 15052800.

The previous prime is 64329539. The next prime is 64329541. The reversal of 64329540 is 4592346.

It is an interprime number because it is at equal distance from previous prime (64329539) and next prime (64329541).

It is a super-2 number, since 2×64329540² = 8276579433223200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (64329541) 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, 17460 + ... + 20820.

It is an arithmetic number, because the mean of its divisors is an integer number (2118060).

Almost surely, 2^64329540 is an apocalyptic number.

64329540 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 64329540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101666880).

64329540 is an abundant number, since it is smaller than the sum of its proper divisors (139004220).

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

64329540 is a wasteful number, since it uses less digits than its factorization.

64329540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413 (or 3411 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 64329540 is about 8020.5698051946. The cubic root of 64329540 is about 400.6853666773.

The spelling of 64329540 in words is "sixty-four million, three hundred twenty-nine thousand, five hundred forty".