61731280 has 40 divisors (see below), whose sum is σ = 154568232. Its totient is φ = 22792704.

The previous prime is 61731277. The next prime is 61731283. The reversal of 61731280 is 8213716.

It is an interprime number because it is at equal distance from previous prime (61731277) and next prime (61731283).

It can be written as a sum of positive squares in 4 ways, for example, as 1140624 + 60590656 = 1068^2 + 7784^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61731283) 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, 28639 + ... + 30718.

Almost surely, 2^61731280 is an apocalyptic number.

It is an amenable number.

61731280 is an abundant number, since it is smaller than the sum of its proper divisors (92836952).

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

61731280 is a wasteful number, since it uses less digits than its factorization.

61731280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59383 (or 59377 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 61731280 is about 7856.9256073861. The cubic root of 61731280 is about 395.2165239202.

Adding to 61731280 its reverse (8213716), we get a palindrome (69944996).

The spelling of 61731280 in words is "sixty-one million, seven hundred thirty-one thousand, two hundred eighty".