61693640 has 32 divisors (see below), whose sum is σ = 139207680. Its totient is φ = 24606912.

The previous prime is 61693637. The next prime is 61693693. The reversal of 61693640 is 4639616.

It is a super-2 number, since 2×61693640² = 7612210432899200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61693640.

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, 13307 + ... + 17333.

It is an arithmetic number, because the mean of its divisors is an integer number (4350240).

Almost surely, 2^61693640 is an apocalyptic number.

It is an amenable number.

61693640 is an abundant number, since it is smaller than the sum of its proper divisors (77514040).

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

61693640 is a wasteful number, since it uses less digits than its factorization.

61693640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4421 (or 4417 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 61693640 is about 7854.5299031833. The cubic root of 61693640 is about 395.1361812130.

The spelling of 61693640 in words is "sixty-one million, six hundred ninety-three thousand, six hundred forty".