61889870 has 32 divisors (see below), whose sum is σ = 128521728. Its totient is φ = 21018528.

The previous prime is 61889831. The next prime is 61889881. The reversal of 61889870 is 7898816.

It is a Curzon number.

It is a congruent 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, 3359 + ... + 11621.

It is an arithmetic number, because the mean of its divisors is an integer number (4016304).

Almost surely, 2^61889870 is an apocalyptic number.

61889870 is an abundant number, since it is smaller than the sum of its proper divisors (66631858).

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

61889870 is a wasteful number, since it uses less digits than its factorization.

61889870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8384.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 61889870 is about 7867.0115037414. The cubic root of 61889870 is about 395.5546765903.

The spelling of 61889870 in words is "sixty-one million, eight hundred eighty-nine thousand, eight hundred seventy".