61947739900 has 36 divisors (see below), whose sum is σ = 142334046288. Its totient is φ = 23321501440.

The previous prime is 61947739877. The next prime is 61947739907. The reversal of 61947739900 is 993774916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61947739907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18218224 + ... + 18221623.

It is an arithmetic number, because the mean of its divisors is an integer number (3953723508).

Almost surely, 2^61947739900 is an apocalyptic number.

It is an amenable number.

61947739900 is an abundant number, since it is smaller than the sum of its proper divisors (80386306388).

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

61947739900 is a wasteful number, since it uses less digits than its factorization.

61947739900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36439878 (or 36439871 counting only the distinct ones).

The product of its (nonzero) digits is 2571912, while the sum is 55.

The spelling of 61947739900 in words is "sixty-one billion, nine hundred forty-seven million, seven hundred thirty-nine thousand, nine hundred".