61903620 has 72 divisors (see below), whose sum is σ = 188522880. Its totient is φ = 16441920.

The previous prime is 61903609. The next prime is 61903637. The reversal of 61903620 is 2630916.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59061 + ... + 60099.

Almost surely, 2^61903620 is an apocalyptic number.

61903620 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 61903620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94261440).

61903620 is an abundant number, since it is smaller than the sum of its proper divisors (126619260).

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

61903620 is a wasteful number, since it uses less digits than its factorization.

61903620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385 (or 1380 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 61903620 is about 7867.8853575786. The cubic root of 61903620 is about 395.5839677277.

The spelling of 61903620 in words is "sixty-one million, nine hundred three thousand, six hundred twenty".