61004040 has 32 divisors (see below), whose sum is σ = 183012480. Its totient is φ = 16267712.

The previous prime is 61004039. The next prime is 61004051. The reversal of 61004040 is 4040016.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254064 + ... + 254303.

It is an arithmetic number, because the mean of its divisors is an integer number (5719140).

Almost surely, 2^61004040 is an apocalyptic number.

61004040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61004040 is an abundant number, since it is smaller than the sum of its proper divisors (122008440).

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

61004040 is a wasteful number, since it uses less digits than its factorization.

61004040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508381 (or 508377 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 61004040 is about 7810.5083061220. The cubic root of 61004040 is about 393.6584085275.

Adding to 61004040 its reverse (4040016), we get a palindrome (65044056).

The spelling of 61004040 in words is "sixty-one million, four thousand, forty".