61435140 has 96 divisors (see below), whose sum is σ = 187783680. Its totient is φ = 14916096.

The previous prime is 61435117. The next prime is 61435163. The reversal of 61435140 is 4153416.

It is an interprime number because it is at equal distance from previous prime (61435117) and next prime (61435163).

It is a self number, because there is not a number n which added to its sum of digits gives 61435140.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61122 + ... + 62118.

It is an arithmetic number, because the mean of its divisors is an integer number (1956080).

Almost surely, 2^61435140 is an apocalyptic number.

61435140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61435140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93891840).

61435140 is an abundant number, since it is smaller than the sum of its proper divisors (126348540).

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

61435140 is a wasteful number, since it uses less digits than its factorization.

61435140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1099 counting only the distinct ones).

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

The square root of 61435140 is about 7838.0571572297. The cubic root of 61435140 is about 394.5835272863.

Adding to 61435140 its reverse (4153416), we get a palindrome (65588556).

The spelling of 61435140 in words is "sixty-one million, four hundred thirty-five thousand, one hundred forty".