61918500 has 96 divisors (see below), whose sum is σ = 206099712. Its totient is φ = 14150400.

The previous prime is 61918499. The next prime is 61918513. The reversal of 61918500 is 581916.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 7552 + ... + 13448.

It is an arithmetic number, because the mean of its divisors is an integer number (2146872).

Almost surely, 2^61918500 is an apocalyptic number.

61918500 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 61918500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103049856).

61918500 is an abundant number, since it is smaller than the sum of its proper divisors (144181212).

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

61918500 is a wasteful number, since it uses less digits than its factorization.

61918500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5926 (or 5914 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 61918500 is about 7868.8309169787. The cubic root of 61918500 is about 395.6156611778.

The spelling of 61918500 in words is "sixty-one million, nine hundred eighteen thousand, five hundred".