61539898 has 64 divisors (see below), whose sum is σ = 121651200. Its totient is φ = 22705920.

The previous prime is 61539883. The next prime is 61539901. The reversal of 61539898 is 89893516.

61539898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139963 + ... + 140401.

It is an arithmetic number, because the mean of its divisors is an integer number (1900800).

Almost surely, 2^61539898 is an apocalyptic number.

61539898 is a deficient number, since it is larger than the sum of its proper divisors (60111302).

61539898 is a wasteful number, since it uses less digits than its factorization.

61539898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its digits is 466560, while the sum is 49.

The square root of 61539898 is about 7844.7369618108. The cubic root of 61539898 is about 394.8076786347.

The spelling of 61539898 in words is "sixty-one million, five hundred thirty-nine thousand, eight hundred ninety-eight".