64140519 has 16 divisors (see below), whose sum is σ = 88500224. Its totient is φ = 41277600.

The previous prime is 64140497. The next prime is 64140539. The reversal of 64140519 is 91504146.

It is a happy number.

It is not a de Polignac number, because 64140519 - 2²³ = 55751911 is a prime.

It is a super-2 number, since 2×64140519² = 8228012355178722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64140539) 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, 58137 + ... + 59229.

It is an arithmetic number, because the mean of its divisors is an integer number (5531264).

Almost surely, 2^64140519 is an apocalyptic number.

64140519 is a deficient number, since it is larger than the sum of its proper divisors (24359705).

64140519 is a wasteful number, since it uses less digits than its factorization.

64140519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 64140519 is about 8008.7776220844. Note that the first 3 decimals coincide. The cubic root of 64140519 is about 400.2925339243.

The spelling of 64140519 in words is "sixty-four million, one hundred forty thousand, five hundred nineteen".