78461671 has 4 divisors (see below), whose sum is σ = 81873072. Its totient is φ = 75050272.

The previous prime is 78461639. The next prime is 78461683. The reversal of 78461671 is 17616487.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78461671 - 2⁵ = 78461639 is a prime.

It is a super-2 number, since 2×78461671² = 12312467632224482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78461611) 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, 1705666 + ... + 1705711.

It is an arithmetic number, because the mean of its divisors is an integer number (20468268).

Almost surely, 2^78461671 is an apocalyptic number.

78461671 is a deficient number, since it is larger than the sum of its proper divisors (3411401).

78461671 is a wasteful number, since it uses less digits than its factorization.

78461671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3411400.

The product of its digits is 56448, while the sum is 40.

The square root of 78461671 is about 8857.8592786293. The cubic root of 78461671 is about 428.1071859389.

The spelling of 78461671 in words is "seventy-eight million, four hundred sixty-one thousand, six hundred seventy-one".