61640433 has 10 divisors (see below), whose sum is σ = 92080274. Its totient is φ = 41093568.

The previous prime is 61640417. The next prime is 61640443. The reversal of 61640433 is 33404616.

61640433 is a `hidden beast` number, since 616 + 4 + 0 + 43 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61027344 + 613089 = 7812^2 + 783^2 .

It is not a de Polignac number, because 61640433 - 2⁴ = 61640417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61640397 and 61640406.

It is not an unprimeable number, because it can be changed into a prime (61640413) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 380416 + ... + 380577.

Almost surely, 2^61640433 is an apocalyptic number.

It is an amenable number.

61640433 is a deficient number, since it is larger than the sum of its proper divisors (30439841).

61640433 is an equidigital number, since it uses as much as digits as its factorization.

61640433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761005 (or 760996 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 61640433 is about 7851.1421462103. The cubic root of 61640433 is about 395.0225549263.

The spelling of 61640433 in words is "sixty-one million, six hundred forty thousand, four hundred thirty-three".