61969500 has 144 divisors (see below), whose sum is σ = 200333952. Its totient is φ = 16118400.

The previous prime is 61969477. The next prime is 61969511. The reversal of 61969500 is 596916.

61969500 is a `hidden beast` number, since 61 + 96 + 9 + 500 = 666.

61969500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 47 ways as a sum of consecutive naturals, for example, 211354 + ... + 211646.

It is an arithmetic number, because the mean of its divisors is an integer number (1391208).

Almost surely, 2^61969500 is an apocalyptic number.

61969500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61969500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100166976).

61969500 is an abundant number, since it is smaller than the sum of its proper divisors (138364452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61969500 is a wasteful number, since it uses less digits than its factorization.

61969500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 61969500 is about 7872.0708838272. The cubic root of 61969500 is about 395.7242494120.

The spelling of 61969500 in words is "sixty-one million, nine hundred sixty-nine thousand, five hundred".