78891461 has 4 divisors (see below), whose sum is σ = 86063424. Its totient is φ = 71719500.

The previous prime is 78891451. The next prime is 78891481. The reversal of 78891461 is 16419887.

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 78891461 - 2²² = 74697157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78891451) 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, 3585965 + ... + 3585986.

It is an arithmetic number, because the mean of its divisors is an integer number (21515856).

Almost surely, 2^78891461 is an apocalyptic number.

It is an amenable number.

78891461 is a deficient number, since it is larger than the sum of its proper divisors (7171963).

78891461 is a wasteful number, since it uses less digits than its factorization.

78891461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7171962.

The product of its digits is 96768, while the sum is 44.

The square root of 78891461 is about 8882.0865228841. The cubic root of 78891461 is about 428.8874448209.

The spelling of 78891461 in words is "seventy-eight million, eight hundred ninety-one thousand, four hundred sixty-one".