64861787 has 4 divisors (see below), whose sum is σ = 64879920. Its totient is φ = 64843656.

The previous prime is 64861781. The next prime is 64861793. The reversal of 64861787 is 78716846.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64861781) and next prime (64861793).

It is a cyclic number.

It is not a de Polignac number, because 64861787 - 2¹² = 64857691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64861781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1712 + ... + 11517.

It is an arithmetic number, because the mean of its divisors is an integer number (16219980).

Almost surely, 2^64861787 is an apocalyptic number.

64861787 is a deficient number, since it is larger than the sum of its proper divisors (18133).

64861787 is a wasteful number, since it uses less digits than its factorization.

64861787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18132.

The product of its digits is 451584, while the sum is 47.

The square root of 64861787 is about 8053.6815804947. The cubic root of 64861787 is about 401.7873907725.

The spelling of 64861787 in words is "sixty-four million, eight hundred sixty-one thousand, seven hundred eighty-seven".