61670556 has 18 divisors (see below), whose sum is σ = 155889552. Its totient is φ = 20556840.

The previous prime is 61670549. The next prime is 61670569. The reversal of 61670556 is 65507616.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1713071 = 61670556 / (6 + 1 + 6 + 7 + 0 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 61670556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 856500 + ... + 856571.

Almost surely, 2^61670556 is an apocalyptic number.

It is an amenable number.

61670556 is an abundant number, since it is smaller than the sum of its proper divisors (94218996).

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

61670556 is a wasteful number, since it uses less digits than its factorization.

61670556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713081 (or 1713076 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 61670556 is about 7853.0602951970. The cubic root of 61670556 is about 395.0868921696.

It can be divided in two parts, 61670 and 556, that added together give a palindrome (62226).

The spelling of 61670556 in words is "sixty-one million, six hundred seventy thousand, five hundred fifty-six".