64691466 has 96 divisors (see below), whose sum is σ = 163229760. Its totient is φ = 16982784.

The previous prime is 64691461. The next prime is 64691467. The reversal of 64691466 is 66419646.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (64691461) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 206526 + ... + 206838.

It is an arithmetic number, because the mean of its divisors is an integer number (1700310).

Almost surely, 2^64691466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64691466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81614880).

64691466 is an abundant number, since it is smaller than the sum of its proper divisors (98538294).

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

64691466 is a wasteful number, since it uses less digits than its factorization.

64691466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 381 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 64691466 is about 8043.1005215651. The cubic root of 64691466 is about 401.4353970933.

The spelling of 64691466 in words is "sixty-four million, six hundred ninety-one thousand, four hundred sixty-six".