61640434 has 4 divisors (see below), whose sum is σ = 92460654. Its totient is φ = 30820216.

The previous prime is 61640417. The next prime is 61640443. The reversal of 61640434 is 43404616.

It is a happy number.

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., 61575409 + 65025 = 7847^2 + 255^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15410107 + ... + 15410110.

Almost surely, 2^61640434 is an apocalyptic number.

61640434 is a deficient number, since it is larger than the sum of its proper divisors (30820220).

61640434 is a wasteful number, since it uses less digits than its factorization.

61640434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30820219.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 61640434 is about 7851.1422098953. The cubic root of 61640434 is about 395.0225570625.

The spelling of 61640434 in words is "sixty-one million, six hundred forty thousand, four hundred thirty-four".