64691140 has 48 divisors (see below), whose sum is σ = 140232960. Its totient is φ = 25056000.

The previous prime is 64691093. The next prime is 64691149. The reversal of 64691140 is 4119646.

It is not an unprimeable number, because it can be changed into a prime (64691149) 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, 85765 + ... + 86515.

It is an arithmetic number, because the mean of its divisors is an integer number (2921520).

Almost surely, 2^64691140 is an apocalyptic number.

It is an amenable number.

64691140 is an abundant number, since it is smaller than the sum of its proper divisors (75541820).

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

64691140 is a wasteful number, since it uses less digits than its factorization.

64691140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892 (or 890 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 64691140 is about 8043.0802557229. The cubic root of 64691140 is about 401.4347227737.

The spelling of 64691140 in words is "sixty-four million, six hundred ninety-one thousand, one hundred forty".