61501340 has 24 divisors (see below), whose sum is σ = 130712400. Its totient is φ = 24303488.

The previous prime is 61501339. The next prime is 61501343. The reversal of 61501340 is 4310516.

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 (61501343) 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, 16865 + ... + 20184.

It is an arithmetic number, because the mean of its divisors is an integer number (5446350).

Almost surely, 2^61501340 is an apocalyptic number.

It is an amenable number.

61501340 is an abundant number, since it is smaller than the sum of its proper divisors (69211060).

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

61501340 is a wasteful number, since it uses less digits than its factorization.

61501340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37141 (or 37139 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 61501340 is about 7842.2790054932. The cubic root of 61501340 is about 394.7252054457.

Adding to 61501340 its reverse (4310516), we get a palindrome (65811856).

The spelling of 61501340 in words is "sixty-one million, five hundred one thousand, three hundred forty".