78352561 has 16 divisors (see below), whose sum is σ = 94514560. Its totient is φ = 63452160.

The previous prime is 78352553. The next prime is 78352591. The reversal of 78352561 is 16525387.

It is a cyclic number.

It is not a de Polignac number, because 78352561 - 2³ = 78352553 is a prime.

It is a super-2 number, since 2×78352561² = 12278247630517442, 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 78352561.

It is not an unprimeable number, because it can be changed into a prime (78352501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76231 + ... + 77251.

It is an arithmetic number, because the mean of its divisors is an integer number (5907160).

Almost surely, 2^78352561 is an apocalyptic number.

It is an amenable number.

78352561 is a deficient number, since it is larger than the sum of its proper divisors (16161999).

78352561 is a wasteful number, since it uses less digits than its factorization.

78352561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624.

The product of its digits is 50400, while the sum is 37.

The square root of 78352561 is about 8851.6981986509. The cubic root of 78352561 is about 427.9086497473.

The spelling of 78352561 in words is "seventy-eight million, three hundred fifty-two thousand, five hundred sixty-one".