64500000 has 168 divisors, whose sum is σ = 216559728. Its totient is φ = 16800000.

The previous prime is 64499999. The next prime is 64500001. The reversal of 64500000 is 546.

It is an interprime number because it is at equal distance from previous prime (64499999) and next prime (64500001).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (64500001) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1499979 + ... + 1500021.

It is an arithmetic number, because the mean of its divisors is an integer number (1289046).

Almost surely, 2^64500000 is an apocalyptic number.

64500000 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 64500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108279864).

64500000 is an abundant number, since it is smaller than the sum of its proper divisors (152059728).

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

64500000 is an frugal number, since it uses more digits than its factorization.

64500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 64500000 is about 8031.1892021045. The cubic root of 64500000 is about 401.0389657058.

Adding to 64500000 its reverse (546), we get a palindrome (64500546).

It can be divided in two parts, 6 and 4500000, that multiplied together give a cube (27000000 = 300³).

The spelling of 64500000 in words is "sixty-four million, five hundred thousand".