78377047 has 4 divisors (see below), whose sum is σ = 89573776. Its totient is φ = 67180320.

The previous prime is 78377029. The next prime is 78377087. The reversal of 78377047 is 74077387.

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 78377047 - 2¹¹ = 78374999 is a prime.

It is a super-2 number, since 2×78377047² = 12285922992880418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78376994 and 78377012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78377087) 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, 5598354 + ... + 5598367.

It is an arithmetic number, because the mean of its divisors is an integer number (22393444).

Almost surely, 2^78377047 is an apocalyptic number.

78377047 is a deficient number, since it is larger than the sum of its proper divisors (11196729).

78377047 is a wasteful number, since it uses less digits than its factorization.

78377047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11196728.

The product of its (nonzero) digits is 230496, while the sum is 43.

The square root of 78377047 is about 8853.0812150347. The cubic root of 78377047 is about 427.9532204237.

It can be divided in two parts, 7837 and 7047, that added together give a square (14884 = 122²).

The spelling of 78377047 in words is "seventy-eight million, three hundred seventy-seven thousand, forty-seven".