61969590 has 128 divisors (see below), whose sum is σ = 182891520. Its totient is φ = 14851584.

The previous prime is 61969559. The next prime is 61969619. The reversal of 61969590 is 9596916.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 105277 + ... + 105863.

It is an arithmetic number, because the mean of its divisors is an integer number (1428840).

Almost surely, 2^61969590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61969590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91445760).

61969590 is an abundant number, since it is smaller than the sum of its proper divisors (120921930).

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

61969590 is a wasteful number, since it uses less digits than its factorization.

61969590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 61969590 is about 7872.0766002371. The cubic root of 61969590 is about 395.7244409856.

The spelling of 61969590 in words is "sixty-one million, nine hundred sixty-nine thousand, five hundred ninety".