64693390 has 32 divisors (see below), whose sum is σ = 121888800. Its totient is φ = 24695424.

The previous prime is 64693357. The next prime is 64693399. The reversal of 64693390 is 9339646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64693399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17961 + ... + 21259.

It is an arithmetic number, because the mean of its divisors is an integer number (3809025).

Almost surely, 2^64693390 is an apocalyptic number.

64693390 is a deficient number, since it is larger than the sum of its proper divisors (57195410).

64693390 is a wasteful number, since it uses less digits than its factorization.

64693390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 64693390 is about 8043.2201262927. The cubic root of 64693390 is about 401.4393767735.

The spelling of 64693390 in words is "sixty-four million, six hundred ninety-three thousand, three hundred ninety".