61289477388 has 96 divisors (see below), whose sum is σ = 160207891200. Its totient is φ = 20261809152.

The previous prime is 61289477377. The next prime is 61289477393. The reversal of 61289477388 is 88377498216.

61289477388 is a `hidden beast` number, since 6 + 1 + 2 + 89 + 477 + 3 + 88 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22261420 + ... + 22264172.

It is an arithmetic number, because the mean of its divisors is an integer number (1668832200).

Almost surely, 2^61289477388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61289477388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80103945600).

61289477388 is an abundant number, since it is smaller than the sum of its proper divisors (98918413812).

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

61289477388 is a wasteful number, since it uses less digits than its factorization.

61289477388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388 (or 4380 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 61289477388 in words is "sixty-one billion, two hundred eighty-nine million, four hundred seventy-seven thousand, three hundred eighty-eight".