61261720 has 32 divisors (see below), whose sum is σ = 148443120. Its totient is φ = 22619520.

The previous prime is 61261703. The next prime is 61261721. The reversal of 61261720 is 2716216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61261721) 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, 58386 + ... + 59425.

Almost surely, 2^61261720 is an apocalyptic number.

It is an amenable number.

61261720 is an abundant number, since it is smaller than the sum of its proper divisors (87181400).

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

61261720 is a wasteful number, since it uses less digits than its factorization.

61261720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117835 (or 117831 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 61261720 is about 7826.9866487685. The cubic root of 61261720 is about 394.2118986950.

Adding to 61261720 its reverse (2716216), we get a palindrome (63977936).

The spelling of 61261720 in words is "sixty-one million, two hundred sixty-one thousand, seven hundred twenty".