61990110 has 240 divisors, whose sum is σ = 212468256. Its totient is φ = 12628224.

The previous prime is 61990099. The next prime is 61990121. The reversal of 61990110 is 1109916.

It is an interprime number because it is at equal distance from previous prime (61990099) and next prime (61990121).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2137576 + ... + 2137604.

Almost surely, 2^61990110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61990110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106234128).

61990110 is an abundant number, since it is smaller than the sum of its proper divisors (150478146).

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

61990110 is a wasteful number, since it uses less digits than its factorization.

61990110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 61990110 is about 7873.3798333371. The cubic root of 61990110 is about 395.7681149306.

The spelling of 61990110 in words is "sixty-one million, nine hundred ninety thousand, one hundred ten".