61667540 has 48 divisors (see below), whose sum is σ = 148720320. Its totient is φ = 21242880.

The previous prime is 61667527. The next prime is 61667561. The reversal of 61667540 is 4576616.

It is a self number, because there is not a number n which added to its sum of digits gives 61667540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3197 + ... + 11556.

It is an arithmetic number, because the mean of its divisors is an integer number (3098340).

Almost surely, 2^61667540 is an apocalyptic number.

It is an amenable number.

61667540 is an abundant number, since it is smaller than the sum of its proper divisors (87052780).

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

61667540 is a wasteful number, since it uses less digits than its factorization.

61667540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14792 (or 14790 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 61667540 is about 7852.8682657994. The cubic root of 61667540 is about 395.0804514867.

The spelling of 61667540 in words is "sixty-one million, six hundred sixty-seven thousand, five hundred forty".