61564036 has 12 divisors (see below), whose sum is σ = 107920540. Its totient is φ = 30729600.

The previous prime is 61563979. The next prime is 61564037. The reversal of 61564036 is 63046516.

It can be written as a sum of positive squares in 2 ways, for example, as 58522500 + 3041536 = 7650^2 + 1744^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 61563989 and 61564007.

It is not an unprimeable number, because it can be changed into a prime (61564037) 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, 10401 + ... + 15208.

Almost surely, 2^61564036 is an apocalyptic number.

It is an amenable number.

61564036 is a deficient number, since it is larger than the sum of its proper divisors (46356504).

61564036 is a wasteful number, since it uses less digits than its factorization.

61564036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26214 (or 26212 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 61564036 is about 7846.2752946860. The cubic root of 61564036 is about 394.8592907993.

The spelling of 61564036 in words is "sixty-one million, five hundred sixty-four thousand, thirty-six".