61609290 has 16 divisors (see below), whose sum is σ = 147862368. Its totient is φ = 16429136.

The previous prime is 61609283. The next prime is 61609291. The reversal of 61609290 is 9290616.

It is a happy number.

It is a super-2 number, since 2×61609290² = 7591409228608200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61609291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026792 + ... + 1026851.

It is an arithmetic number, because the mean of its divisors is an integer number (9241398).

Almost surely, 2^61609290 is an apocalyptic number.

61609290 is an abundant number, since it is smaller than the sum of its proper divisors (86253078).

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

61609290 is a wasteful number, since it uses less digits than its factorization.

61609290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053653.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 61609290 is about 7849.1585536285. The cubic root of 61609290 is about 394.9560171077.

The spelling of 61609290 in words is "sixty-one million, six hundred nine thousand, two hundred ninety".