61078920 has 256 divisors, whose sum is σ = 228096000. Its totient is φ = 12773376.

The previous prime is 61078883. The next prime is 61078921. The reversal of 61078920 is 2987016.

It is not an unprimeable number, because it can be changed into a prime (61078921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 686236 + ... + 686324.

It is an arithmetic number, because the mean of its divisors is an integer number (891000).

Almost surely, 2^61078920 is an apocalyptic number.

61078920 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 61078920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114048000).

61078920 is an abundant number, since it is smaller than the sum of its proper divisors (167017080).

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

61078920 is a wasteful number, since it uses less digits than its factorization.

61078920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 61078920 is about 7815.3003781045. The cubic root of 61078920 is about 393.8194092807.

The spelling of 61078920 in words is "sixty-one million, seventy-eight thousand, nine hundred twenty".