61648890 has 32 divisors (see below), whose sum is σ = 148196736. Its totient is φ = 16413120.

The previous prime is 61648889. The next prime is 61648907. The reversal of 61648890 is 9884616.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23379 + ... + 25881.

It is an arithmetic number, because the mean of its divisors is an integer number (4631148).

Almost surely, 2^61648890 is an apocalyptic number.

61648890 is an abundant number, since it is smaller than the sum of its proper divisors (86547846).

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

61648890 is a wasteful number, since it uses less digits than its factorization.

61648890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 61648890 is about 7851.6807117967. The cubic root of 61648890 is about 395.0406196544.

The spelling of 61648890 in words is "sixty-one million, six hundred forty-eight thousand, eight hundred ninety".