53778564 has 36 divisors (see below), whose sum is σ = 155361024. Its totient is φ = 15365232.

The previous prime is 53778553. The next prime is 53778587. The reversal of 53778564 is 46587735.

It is a tau number, because it is divible by the number of its divisors (36).

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, 106452 + ... + 106955.

It is an arithmetic number, because the mean of its divisors is an integer number (4315584).

Almost surely, 2^53778564 is an apocalyptic number.

It is an amenable number.

53778564 is an abundant number, since it is smaller than the sum of its proper divisors (101582460).

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

53778564 is a wasteful number, since it uses less digits than its factorization.

53778564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213424 (or 213419 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The square root of 53778564 is about 7333.3869391980. The cubic root of 53778564 is about 377.4589555247.

The spelling of 53778564 in words is "fifty-three million, seven hundred seventy-eight thousand, five hundred sixty-four".