61921908 has 60 divisors (see below), whose sum is σ = 162624000. Its totient is φ = 20545488.

The previous prime is 61921879. The next prime is 61921913. The reversal of 61921908 is 80912916.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 123843 + ... + 124341.

It is an arithmetic number, because the mean of its divisors is an integer number (2710400).

Almost surely, 2^61921908 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 61921908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81312000).

61921908 is an abundant number, since it is smaller than the sum of its proper divisors (100702092).

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

61921908 is a wasteful number, since it uses less digits than its factorization.

61921908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 61921908 is about 7869.0474645919. The cubic root of 61921908 is about 395.6229192856.

It can be divided in two parts, 6192 and 1908, that added together give a square (8100 = 90²).

The spelling of 61921908 in words is "sixty-one million, nine hundred twenty-one thousand, nine hundred eight".