78601553 has 4 divisors (see below), whose sum is σ = 78625008. Its totient is φ = 78578100.

The previous prime is 78601547. The next prime is 78601583. The reversal of 78601553 is 35510687.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78601553 - 2⁸ = 78601297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78601583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5651 + ... + 13752.

It is an arithmetic number, because the mean of its divisors is an integer number (19656252).

Almost surely, 2^78601553 is an apocalyptic number.

It is an amenable number.

78601553 is a deficient number, since it is larger than the sum of its proper divisors (23455).

78601553 is a wasteful number, since it uses less digits than its factorization.

78601553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23454.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 78601553 is about 8865.7516883793. The cubic root of 78601553 is about 428.3614456997.

The spelling of 78601553 in words is "seventy-eight million, six hundred one thousand, five hundred fifty-three".