61564764 has 12 divisors (see below), whose sum is σ = 143651144. Its totient is φ = 20521584.

The previous prime is 61564733. The next prime is 61564787. The reversal of 61564764 is 46746516.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565187 + ... + 2565210.

Almost surely, 2^61564764 is an apocalyptic number.

It is an amenable number.

61564764 is an abundant number, since it is smaller than the sum of its proper divisors (82086380).

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

61564764 is a wasteful number, since it uses less digits than its factorization.

61564764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130404 (or 5130402 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The square root of 61564764 is about 7846.3216859876. The cubic root of 61564764 is about 394.8608472081.

The spelling of 61564764 in words is "sixty-one million, five hundred sixty-four thousand, seven hundred sixty-four".