64649970 has 192 divisors, whose sum is σ = 221045760. Its totient is φ = 12700800.

The previous prime is 64649969. The next prime is 64650011. The reversal of 64649970 is 7994646.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 131425 + ... + 131915.

It is an arithmetic number, because the mean of its divisors is an integer number (1151280).

Almost surely, 2^64649970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64649970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110522880).

64649970 is an abundant number, since it is smaller than the sum of its proper divisors (156395790).

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

64649970 is a wasteful number, since it uses less digits than its factorization.

64649970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 64649970 is about 8040.5205055394. The cubic root of 64649970 is about 401.3495458610.

The spelling of 64649970 in words is "sixty-four million, six hundred forty-nine thousand, nine hundred seventy".