64421055 has 32 divisors (see below), whose sum is σ = 114892800. Its totient is φ = 34248096.

The previous prime is 64421017. The next prime is 64421081. The reversal of 64421055 is 55012446.

64421055 is a `hidden beast` number, since 644 + 2 + 10 + 5 + 5 = 666.

It is not a de Polignac number, because 64421055 - 2⁶ = 64420991 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 58722 + ... + 59808.

It is an arithmetic number, because the mean of its divisors is an integer number (3590400).

Almost surely, 2^64421055 is an apocalyptic number.

64421055 is a deficient number, since it is larger than the sum of its proper divisors (50471745).

64421055 is a wasteful number, since it uses less digits than its factorization.

64421055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540 (or 1534 counting only the distinct ones).

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

The square root of 64421055 is about 8026.2727962610. The cubic root of 64421055 is about 400.8752812266.

The spelling of 64421055 in words is "sixty-four million, four hundred twenty-one thousand, fifty-five".