64861550 has 24 divisors (see below), whose sum is σ = 129923976. Its totient is φ = 23948640.

The previous prime is 64861543. The next prime is 64861583. The reversal of 64861550 is 5516846.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64861550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49244 + ... + 50543.

It is an arithmetic number, because the mean of its divisors is an integer number (5413499).

Almost surely, 2^64861550 is an apocalyptic number.

64861550 is an abundant number, since it is smaller than the sum of its proper divisors (65062426).

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

64861550 is a wasteful number, since it uses less digits than its factorization.

64861550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99812 (or 99807 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 64861550 is about 8053.6668667136. Note that the first 3 decimals coincide. The cubic root of 64861550 is about 401.7869014051.

The spelling of 64861550 in words is "sixty-four million, eight hundred sixty-one thousand, five hundred fifty".