64915000 has 40 divisors (see below), whose sum is σ = 152107560. Its totient is φ = 25964000.

The previous prime is 64914991. The next prime is 64915003. The reversal of 64915000 is 51946.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64915003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1492 + ... + 11491.

It is an arithmetic number, because the mean of its divisors is an integer number (3802689).

Almost surely, 2^64915000 is an apocalyptic number.

It is an amenable number.

64915000 is an abundant number, since it is smaller than the sum of its proper divisors (87192560).

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

64915000 is a wasteful number, since it uses less digits than its factorization.

64915000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13009 (or 12990 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 64915000 is about 8056.9845475835. The cubic root of 64915000 is about 401.8972370021.

Adding to 64915000 its reverse (51946), we get a palindrome (64966946).

The spelling of 64915000 in words is "sixty-four million, nine hundred fifteen thousand".