61989902 has 16 divisors (see below), whose sum is σ = 100316832. Its totient is φ = 28559520.

The previous prime is 61989877. The next prime is 61989919. The reversal of 61989902 is 20998916.

61989902 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 15383 + ... + 18989.

It is an arithmetic number, because the mean of its divisors is an integer number (6269802).

Almost surely, 2^61989902 is an apocalyptic number.

61989902 is a deficient number, since it is larger than the sum of its proper divisors (38326930).

61989902 is a wasteful number, since it uses less digits than its factorization.

61989902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 61989902 is about 7873.3666242593. The cubic root of 61989902 is about 395.7676722801.

The spelling of 61989902 in words is "sixty-one million, nine hundred eighty-nine thousand, nine hundred two".