78129541 has 8 divisors (see below), whose sum is σ = 89686080. Its totient is φ = 66671808.

The previous prime is 78129487. The next prime is 78129547. The reversal of 78129541 is 14592187.

78129541 = 470² + 471² + ... + 696².

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

It is not a de Polignac number, because 78129541 - 2¹⁷ = 77998469 is a prime.

It is a super-2 number, since 2×78129541² = 12208450353741362, 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 78129541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78129547) 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, 22996 + ... + 26173.

It is an arithmetic number, because the mean of its divisors is an integer number (11210760).

Almost surely, 2^78129541 is an apocalyptic number.

It is an amenable number.

78129541 is a deficient number, since it is larger than the sum of its proper divisors (11556539).

78129541 is a wasteful number, since it uses less digits than its factorization.

78129541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49403.

The product of its digits is 20160, while the sum is 37.

The square root of 78129541 is about 8839.0916388507. The cubic root of 78129541 is about 427.5022691762.

The spelling of 78129541 in words is "seventy-eight million, one hundred twenty-nine thousand, five hundred forty-one".