64538487 has 24 divisors (see below), whose sum is σ = 101903984. Its totient is φ = 39118464.

The previous prime is 64538449. The next prime is 64538489. The reversal of 64538487 is 78483546.

It is not a de Polignac number, because 64538487 - 2⁶ = 64538423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64538489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3723 + ... + 11955.

Almost surely, 2^64538487 is an apocalyptic number.

64538487 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

64538487 is a deficient number, since it is larger than the sum of its proper divisors (37365497).

64538487 is a wasteful number, since it uses less digits than its factorization.

64538487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8319 (or 8316 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 64538487 is about 8033.5849407347. The cubic root of 64538487 is about 401.1187161850.

It can be divided in two parts, 64538 and 487, that added together give a square (65025 = 255²).

The spelling of 64538487 in words is "sixty-four million, five hundred thirty-eight thousand, four hundred eighty-seven".