64636390 has 96 divisors (see below), whose sum is σ = 148811040. Its totient is φ = 20030976.

The previous prime is 64636387. The next prime is 64636391. The reversal of 64636390 is 9363646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64636391) 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, 464941 + ... + 465079.

It is an arithmetic number, because the mean of its divisors is an integer number (1550115).

Almost surely, 2^64636390 is an apocalyptic number.

64636390 is an abundant number, since it is smaller than the sum of its proper divisors (84174650).

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

64636390 is a wasteful number, since it uses less digits than its factorization.

64636390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 64636390 is about 8039.6759884961. The cubic root of 64636390 is about 401.3214421692.

The spelling of 64636390 in words is "sixty-four million, six hundred thirty-six thousand, three hundred ninety".