61517240 has 32 divisors (see below), whose sum is σ = 140369760. Its totient is φ = 24259200.

The previous prime is 61517233. The next prime is 61517263. The reversal of 61517240 is 4271516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7991 + ... + 13670.

It is an arithmetic number, because the mean of its divisors is an integer number (4386555).

Almost surely, 2^61517240 is an apocalyptic number.

It is an amenable number.

61517240 is an abundant number, since it is smaller than the sum of its proper divisors (78852520).

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

61517240 is a wasteful number, since it uses less digits than its factorization.

61517240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21743 (or 21739 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 61517240 is about 7843.2926759111. The cubic root of 61517240 is about 394.7592187424.

Adding to 61517240 its reverse (4271516), we get a palindrome (65788756).

The spelling of 61517240 in words is "sixty-one million, five hundred seventeen thousand, two hundred forty".