742640064 has 56 divisors (see below), whose sum is σ = 1970227200. Its totient is φ = 246875904.

The previous prime is 742640039. The next prime is 742640069. The reversal of 742640064 is 460046247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742640069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68487 + ... + 78585.

Almost surely, 2^742640064 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 742640064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985113600).

742640064 is an abundant number, since it is smaller than the sum of its proper divisors (1227587136).

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

742640064 is a wasteful number, since it uses less digits than its factorization.

742640064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10497 (or 10487 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 742640064 is about 27251.4231554978. The cubic root of 742640064 is about 905.5785456508.

The spelling of 742640064 in words is "seven hundred forty-two million, six hundred forty thousand, sixty-four".