61841890 has 24 divisors (see below), whose sum is σ = 122357340. Its totient is φ = 22487520.

The previous prime is 61841887. The next prime is 61841893. The reversal of 61841890 is 9814816.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61841887) and next prime (61841893).

It can be written as a sum of positive squares in 2 ways, for example, as 58782889 + 3059001 = 7667^2 + 1749^2 .

It is not an unprimeable number, because it can be changed into a prime (61841893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24345 + ... + 26764.

Almost surely, 2^61841890 is an apocalyptic number.

61841890 is a deficient number, since it is larger than the sum of its proper divisors (60515450).

61841890 is a wasteful number, since it uses less digits than its factorization.

61841890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51138 (or 51127 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 61841890 is about 7863.9614698954. The cubic root of 61841890 is about 395.4524325025.

The spelling of 61841890 in words is "sixty-one million, eight hundred forty-one thousand, eight hundred ninety".