61990290 has 48 divisors (see below), whose sum is σ = 168187968. Its totient is φ = 15811488.

The previous prime is 61990283. The next prime is 61990309. The reversal of 61990290 is 9209916.

It is a Curzon 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, 12904 + ... + 17043.

It is an arithmetic number, because the mean of its divisors is an integer number (3503916).

Almost surely, 2^61990290 is an apocalyptic number.

61990290 is an abundant number, since it is smaller than the sum of its proper divisors (106197678).

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

61990290 is a wasteful number, since it uses less digits than its factorization.

61990290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29983 (or 29980 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 61990290 is about 7873.3912642520. The cubic root of 61990290 is about 395.7684979928.

It can be divided in two parts, 619 and 90290, that added together give a palindrome (90909).

The spelling of 61990290 in words is "sixty-one million, nine hundred ninety thousand, two hundred ninety".