78540261 has 8 divisors (see below), whose sum is σ = 104983104. Its totient is φ = 52228800.

The previous prime is 78540211. The next prime is 78540313. The reversal of 78540261 is 16204587.

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

It is not a de Polignac number, because 78540261 - 2¹⁷ = 78409189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78540211) 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, 31441 + ... + 33846.

It is an arithmetic number, because the mean of its divisors is an integer number (13122888).

Almost surely, 2^78540261 is an apocalyptic number.

It is an amenable number.

78540261 is a deficient number, since it is larger than the sum of its proper divisors (26442843).

78540261 is a wasteful number, since it uses less digits than its factorization.

78540261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65691.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 78540261 is about 8862.2943417605. The cubic root of 78540261 is about 428.2500740363.

The spelling of 78540261 in words is "seventy-eight million, five hundred forty thousand, two hundred sixty-one".