61564634 has 4 divisors (see below), whose sum is σ = 92346954. Its totient is φ = 30782316.

The previous prime is 61564619. The next prime is 61564661. The reversal of 61564634 is 43646516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 40998409 + 20566225 = 6403^2 + 4535^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61564594 and 61564603.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15391157 + ... + 15391160.

Almost surely, 2^61564634 is an apocalyptic number.

61564634 is a deficient number, since it is larger than the sum of its proper divisors (30782320).

61564634 is a wasteful number, since it uses less digits than its factorization.

61564634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30782319.

The product of its digits is 51840, while the sum is 35.

The square root of 61564634 is about 7846.3134018468. The cubic root of 61564634 is about 394.8605692789.

The spelling of 61564634 in words is "sixty-one million, five hundred sixty-four thousand, six hundred thirty-four".