61521368 has 16 divisors (see below), whose sum is σ = 122138280. Its totient is φ = 28951168.

The previous prime is 61521359. The next prime is 61521379. The reversal of 61521368 is 86312516.

It is a happy number.

It is a congruent number.

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, 226046 + ... + 226317.

Almost surely, 2^61521368 is an apocalyptic number.

61521368 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

61521368 is a deficient number, since it is larger than the sum of its proper divisors (60616912).

61521368 is a wasteful number, since it uses less digits than its factorization.

61521368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452386 (or 452382 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 61521368 is about 7843.5558262819. Note that the first 3 decimals coincide. The cubic root of 61521368 is about 394.7680484060.

The spelling of 61521368 in words is "sixty-one million, five hundred twenty-one thousand, three hundred sixty-eight".