61812040 has 32 divisors (see below), whose sum is σ = 145126080. Its totient is φ = 23649472.

The previous prime is 61812031. The next prime is 61812041. The reversal of 61812040 is 4021816.

It is not an unprimeable number, because it can be changed into a prime (61812041) 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, 32674 + ... + 34513.

It is an arithmetic number, because the mean of its divisors is an integer number (4535190).

Almost surely, 2^61812040 is an apocalyptic number.

It is an amenable number.

61812040 is an abundant number, since it is smaller than the sum of its proper divisors (83314040).

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

61812040 is a wasteful number, since it uses less digits than its factorization.

61812040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67221 (or 67217 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 61812040 is about 7862.0633424057. The cubic root of 61812040 is about 395.3887962690.

Adding to 61812040 its reverse (4021816), we get a palindrome (65833856).

The spelling of 61812040 in words is "sixty-one million, eight hundred twelve thousand, forty".