61919616 has 128 divisors (see below), whose sum is σ = 182424960. Its totient is φ = 18452480.

The previous prime is 61919609. The next prime is 61919621. The reversal of 61919616 is 61691916.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451900 + ... + 452036.

It is an arithmetic number, because the mean of its divisors is an integer number (1425195).

Almost surely, 2^61919616 is an apocalyptic number.

61919616 is a gapful number since it is divisible by the number (66) 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 61919616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91212480).

61919616 is an abundant number, since it is smaller than the sum of its proper divisors (120505344).

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

61919616 is a wasteful number, since it uses less digits than its factorization.

61919616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 260 counting only the distinct ones).

The product of its digits is 17496, while the sum is 39.

The square root of 61919616 is about 7868.9018293533. The cubic root of 61919616 is about 395.6180379819.

The spelling of 61919616 in words is "sixty-one million, nine hundred nineteen thousand, six hundred sixteen".