61240340 has 96 divisors (see below), whose sum is σ = 152990208. Its totient is φ = 20160000.

The previous prime is 61240337. The next prime is 61240343. The reversal of 61240340 is 4304216.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61240337) and next prime (61240343).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61240343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 606290 + ... + 606390.

It is an arithmetic number, because the mean of its divisors is an integer number (1593648).

Almost surely, 2^61240340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61240340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76495104).

61240340 is an abundant number, since it is smaller than the sum of its proper divisors (91749868).

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

61240340 is a wasteful number, since it uses less digits than its factorization.

61240340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 61240340 is about 7825.6207421520. The cubic root of 61240340 is about 394.1660341047.

Adding to 61240340 its reverse (4304216), we get a palindrome (65544556).

The spelling of 61240340 in words is "sixty-one million, two hundred forty thousand, three hundred forty".