78244561 has 8 divisors (see below), whose sum is σ = 80087040. Its totient is φ = 76419408.

The previous prime is 78244549. The next prime is 78244567. The reversal of 78244561 is 16544287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78244561 - 2⁷ = 78244433 is a prime.

It is a super-2 number, since 2×78244561² = 12244422652165442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78244561.

It is not an unprimeable number, because it can be changed into a prime (78244567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5040 + ... + 13486.

It is an arithmetic number, because the mean of its divisors is an integer number (10010880).

Almost surely, 2^78244561 is an apocalyptic number.

It is an amenable number.

78244561 is a deficient number, since it is larger than the sum of its proper divisors (1842479).

78244561 is a wasteful number, since it uses less digits than its factorization.

78244561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8663.

The product of its digits is 53760, while the sum is 37.

The square root of 78244561 is about 8845.5955706781. The cubic root of 78244561 is about 427.7119517136.

The spelling of 78244561 in words is "seventy-eight million, two hundred forty-four thousand, five hundred sixty-one".