61604985 has 32 divisors (see below), whose sum is σ = 106541568. Its totient is φ = 30216960.

The previous prime is 61604953. The next prime is 61604993. The reversal of 61604985 is 58940616.

It is not a de Polignac number, because 61604985 - 2⁵ = 61604953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83679 + ... + 84411.

It is an arithmetic number, because the mean of its divisors is an integer number (3329424).

Almost surely, 2^61604985 is an apocalyptic number.

61604985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61604985 is a deficient number, since it is larger than the sum of its proper divisors (44936583).

61604985 is a wasteful number, since it uses less digits than its factorization.

61604985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 61604985 is about 7848.8843156209. The cubic root of 61604985 is about 394.9468176009.

The spelling of 61604985 in words is "sixty-one million, six hundred four thousand, nine hundred eighty-five".