64140255 has 20 divisors (see below), whose sum is σ = 114978072. Its totient is φ = 34207920.

The previous prime is 64140233. The next prime is 64140301. The reversal of 64140255 is 55204146.

It is a de Polignac number, because none of the positive numbers 2^k-64140255 is a prime.

It is a super-2 number, since 2×64140255² = 8227944622930050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 78781 + ... + 79590.

Almost surely, 2^64140255 is an apocalyptic number.

64140255 is a deficient number, since it is larger than the sum of its proper divisors (50837817).

64140255 is a wasteful number, since it uses less digits than its factorization.

64140255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158388 (or 158379 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 64140255 is about 8008.7611401515. The cubic root of 64140255 is about 400.2919847271.

The spelling of 64140255 in words is "sixty-four million, one hundred forty thousand, two hundred fifty-five".