61640123 has 8 divisors (see below), whose sum is σ = 64957200. Its totient is φ = 58330368.

The previous prime is 61640119. The next prime is 61640129. The reversal of 61640123 is 32104616.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61640123 - 2² = 61640119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61640129) 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, 28463 + ... + 30551.

It is an arithmetic number, because the mean of its divisors is an integer number (8119650).

Almost surely, 2^61640123 is an apocalyptic number.

61640123 is a deficient number, since it is larger than the sum of its proper divisors (3317077).

61640123 is a wasteful number, since it uses less digits than its factorization.

61640123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 61640123 is about 7851.1224038350. The cubic root of 61640123 is about 395.0218927138.

Adding to 61640123 its reverse (32104616), we get a palindrome (93744739).

The spelling of 61640123 in words is "sixty-one million, six hundred forty thousand, one hundred twenty-three".