64488690 has 128 divisors (see below), whose sum is σ = 198720000. Its totient is φ = 14577408.

The previous prime is 64488673. The next prime is 64488707. The reversal of 64488690 is 9688446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64488673) and next prime (64488707).

It is a super-2 number, since 2×64488690² = 8317582275832200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 281496 + ... + 281724.

It is an arithmetic number, because the mean of its divisors is an integer number (1552500).

Almost surely, 2^64488690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64488690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99360000).

64488690 is an abundant number, since it is smaller than the sum of its proper divisors (134231310).

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

64488690 is a wasteful number, since it uses less digits than its factorization.

64488690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 64488690 is about 8030.4850413907. The cubic root of 64488690 is about 401.0155237635.

The spelling of 64488690 in words is "sixty-four million, four hundred eighty-eight thousand, six hundred ninety".