61638434 has 32 divisors (see below), whose sum is σ = 109541376. Its totient is φ = 25643520.

The previous prime is 61638397. The next prime is 61638439. The reversal of 61638434 is 43483616.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61638394 and 61638403.

It is not an unprimeable number, because it can be changed into a prime (61638439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35474 + ... + 37170.

It is an arithmetic number, because the mean of its divisors is an integer number (3423168).

Almost surely, 2^61638434 is an apocalyptic number.

61638434 is a deficient number, since it is larger than the sum of its proper divisors (47902942).

61638434 is a wasteful number, since it uses less digits than its factorization.

61638434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850.

The product of its digits is 41472, while the sum is 35.

The square root of 61638434 is about 7851.0148388600. The cubic root of 61638434 is about 395.0182846847.

The spelling of 61638434 in words is "sixty-one million, six hundred thirty-eight thousand, four hundred thirty-four".