61638803 has 4 divisors (see below), whose sum is σ = 61673520. Its totient is φ = 61604088.

The previous prime is 61638779. The next prime is 61638809. The reversal of 61638803 is 30883616.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61638803 - 2⁸ = 61638547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61638809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14543 + ... + 18296.

It is an arithmetic number, because the mean of its divisors is an integer number (15418380).

Almost surely, 2^61638803 is an apocalyptic number.

61638803 is a deficient number, since it is larger than the sum of its proper divisors (34717).

61638803 is a wasteful number, since it uses less digits than its factorization.

61638803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34716.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 61638803 is about 7851.0383389715. The cubic root of 61638803 is about 395.0190729454.

It can be divided in two parts, 61 and 638803, that multiplied together give a palindrome (38966983).

The spelling of 61638803 in words is "sixty-one million, six hundred thirty-eight thousand, eight hundred three".