61889864 has 16 divisors (see below), whose sum is σ = 117513600. Its totient is φ = 30552912.

The previous prime is 61889831. The next prime is 61889881. The reversal of 61889864 is 46898816.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48332 + ... + 49595.

It is an arithmetic number, because the mean of its divisors is an integer number (7344600).

Almost surely, 2^61889864 is an apocalyptic number.

It is an amenable number.

61889864 is a deficient number, since it is larger than the sum of its proper divisors (55623736).

61889864 is a wasteful number, since it uses less digits than its factorization.

61889864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98012 (or 98008 counting only the distinct ones).

The product of its digits is 663552, while the sum is 50.

The square root of 61889864 is about 7867.0111224022. The cubic root of 61889864 is about 395.5546638077.

The spelling of 61889864 in words is "sixty-one million, eight hundred eighty-nine thousand, eight hundred sixty-four".