61900890 has 32 divisors (see below), whose sum is σ = 149345856. Its totient is φ = 16419840.

The previous prime is 61900871. The next prime is 61900897. The reversal of 61900890 is 9800916.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61900897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445 + ... + 11135.

It is an arithmetic number, because the mean of its divisors is an integer number (4667058).

Almost surely, 2^61900890 is an apocalyptic number.

61900890 is an abundant number, since it is smaller than the sum of its proper divisors (87444966).

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

61900890 is a wasteful number, since it uses less digits than its factorization.

61900890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10894.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 61900890 is about 7867.7118655935. The cubic root of 61900890 is about 395.5781524507.

The spelling of 61900890 in words is "sixty-one million, nine hundred thousand, eight hundred ninety".