61667240 has 16 divisors (see below), whose sum is σ = 138751380. Its totient is φ = 24666880.

The previous prime is 61667237. The next prime is 61667251. The reversal of 61667240 is 4276616.

It can be written as a sum of positive squares in 2 ways, for example, as 56640676 + 5026564 = 7526^2 + 2242^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61667197 and 61667206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770801 + ... + 770880.

Almost surely, 2^61667240 is an apocalyptic number.

It is an amenable number.

61667240 is an abundant number, since it is smaller than the sum of its proper divisors (77084140).

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

61667240 is a wasteful number, since it uses less digits than its factorization.

61667240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541692 (or 1541688 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 61667240 is about 7852.8491644753. The cubic root of 61667240 is about 395.0798108237.

The spelling of 61667240 in words is "sixty-one million, six hundred sixty-seven thousand, two hundred forty".