61345140 has 48 divisors (see below), whose sum is σ = 179238528. Its totient is φ = 15647104.

The previous prime is 61345139. The next prime is 61345147. The reversal of 61345140 is 4154316.

It is a self number, because there is not a number n which added to its sum of digits gives 61345140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61345147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20847 + ... + 23606.

It is an arithmetic number, because the mean of its divisors is an integer number (3734136).

Almost surely, 2^61345140 is an apocalyptic number.

61345140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61345140 is an abundant number, since it is smaller than the sum of its proper divisors (117893388).

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

61345140 is a wasteful number, since it uses less digits than its factorization.

61345140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44488 (or 44486 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 61345140 is about 7832.3138343659. The cubic root of 61345140 is about 394.3907501393.

Adding to 61345140 its reverse (4154316), we get a palindrome (65499456).

It can be divided in two parts, 613 and 45140, that added together give a triangular number (45753 = T₃₀₂).

The spelling of 61345140 in words is "sixty-one million, three hundred forty-five thousand, one hundred forty".