61004140 has 24 divisors (see below), whose sum is σ = 128278080. Its totient is φ = 24369408.

The previous prime is 61004131. The next prime is 61004149. The reversal of 61004140 is 4140016.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61004131) and next prime (61004149).

It is not an unprimeable number, because it can be changed into a prime (61004149) 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, 18669 + ... + 21691.

It is an arithmetic number, because the mean of its divisors is an integer number (5344920).

Almost surely, 2^61004140 is an apocalyptic number.

It is an amenable number.

61004140 is an abundant number, since it is smaller than the sum of its proper divisors (67273940).

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

61004140 is a wasteful number, since it uses less digits than its factorization.

61004140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041 (or 4039 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 61004140 is about 7810.5147077513. The cubic root of 61004140 is about 393.6586236270.

Adding to 61004140 its reverse (4140016), we get a palindrome (65144156).

The spelling of 61004140 in words is "sixty-one million, four thousand, one hundred forty".