61619985 has 96 divisors (see below), whose sum is σ = 133166592. Its totient is φ = 25712640.

The previous prime is 61619981. The next prime is 61620011. The reversal of 61619985 is 58991616.

It is not a de Polignac number, because 61619985 - 2² = 61619981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61619985.

It is not an unprimeable number, because it can be changed into a prime (61619981) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 197980 + ... + 198290.

It is an arithmetic number, because the mean of its divisors is an integer number (1387152).

Almost surely, 2^61619985 is an apocalyptic number.

It is an amenable number.

61619985 is an abundant number, since it is smaller than the sum of its proper divisors (71546607).

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

61619985 is a wasteful number, since it uses less digits than its factorization.

61619985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 380 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 61619985 is about 7849.8398072827. The cubic root of 61619985 is about 394.9788697771.

The spelling of 61619985 in words is "sixty-one million, six hundred nineteen thousand, nine hundred eighty-five".