61640204 has 6 divisors (see below), whose sum is σ = 107870364. Its totient is φ = 30820100.

The previous prime is 61640203. The next prime is 61640209. The reversal of 61640204 is 40204616.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61640204.

It is not an unprimeable number, because it can be changed into a prime (61640203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7705022 + ... + 7705029.

It is an arithmetic number, because the mean of its divisors is an integer number (17978394).

Almost surely, 2^61640204 is an apocalyptic number.

It is an amenable number.

61640204 is a deficient number, since it is larger than the sum of its proper divisors (46230160).

61640204 is a wasteful number, since it uses less digits than its factorization.

61640204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15410055 (or 15410053 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 61640204 is about 7851.1275623314. The cubic root of 61640204 is about 395.0220657438.

The spelling of 61640204 in words is "sixty-one million, six hundred forty thousand, two hundred four".