61279240 has 64 divisors (see below), whose sum is σ = 151787520. Its totient is φ = 22264000.

The previous prime is 61279223. The next prime is 61279241. The reversal of 61279240 is 4297216.

It is not an unprimeable number, because it can be changed into a prime (61279241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52665 + ... + 53815.

It is an arithmetic number, because the mean of its divisors is an integer number (2371680).

Almost surely, 2^61279240 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 61279240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75893760).

61279240 is an abundant number, since it is smaller than the sum of its proper divisors (90508280).

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

61279240 is a wasteful number, since it uses less digits than its factorization.

61279240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195 (or 1169 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 61279240 is about 7828.1057734295. The cubic root of 61279240 is about 394.2494748201.

The spelling of 61279240 in words is "sixty-one million, two hundred seventy-nine thousand, two hundred forty".