61670643 has 8 divisors (see below), whose sum is σ = 84139968. Its totient is φ = 40157544.

The previous prime is 61670633. The next prime is 61670689. The reversal of 61670643 is 34607616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61670643 - 2⁶ = 61670579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61670603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238905 + ... + 239162.

It is an arithmetic number, because the mean of its divisors is an integer number (10517496).

Almost surely, 2^61670643 is an apocalyptic number.

61670643 is a deficient number, since it is larger than the sum of its proper divisors (22469325).

61670643 is a wasteful number, since it uses less digits than its factorization.

61670643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478113.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 61670643 is about 7853.0658344369. The cubic root of 61670643 is about 395.0870779554.

The spelling of 61670643 in words is "sixty-one million, six hundred seventy thousand, six hundred forty-three".