61003640 has 32 divisors (see below), whose sum is σ = 139590000. Its totient is φ = 23986944.

The previous prime is 61003573. The next prime is 61003643. The reversal of 61003640 is 4630016.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61003643) 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, 10565 + ... + 15284.

Almost surely, 2^61003640 is an apocalyptic number.

It is an amenable number.

61003640 is an abundant number, since it is smaller than the sum of its proper divisors (78586360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61003640 is a wasteful number, since it uses less digits than its factorization.

61003640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25919 (or 25915 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 61003640 is about 7810.4826995519. The cubic root of 61003640 is about 393.6575481270.

Adding to 61003640 its reverse (4630016), we get a palindrome (65633656).

The spelling of 61003640 in words is "sixty-one million, three thousand, six hundred forty".