64525780 has 48 divisors (see below), whose sum is σ = 151837056. Its totient is φ = 22826880.

The previous prime is 64525771. The next prime is 64525781. The reversal of 64525780 is 8752546.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64525781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4177 + ... + 12103.

It is an arithmetic number, because the mean of its divisors is an integer number (3163272).

Almost surely, 2^64525780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64525780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75918528).

64525780 is an abundant number, since it is smaller than the sum of its proper divisors (87311276).

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

64525780 is a wasteful number, since it uses less digits than its factorization.

64525780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7984 (or 7982 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 64525780 is about 8032.7940344565. The cubic root of 64525780 is about 401.0923889999.

The spelling of 64525780 in words is "sixty-four million, five hundred twenty-five thousand, seven hundred eighty".