77978441 has 8 divisors (see below), whose sum is σ = 81475200. Its totient is φ = 74490592.

The previous prime is 77978431. The next prime is 77978447. The reversal of 77978441 is 14487977.

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

It is a cyclic number.

It is not a de Polignac number, because 77978441 - 2¹⁴ = 77962057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77978447) 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, 20885 + ... + 24333.

It is an arithmetic number, because the mean of its divisors is an integer number (10184400).

Almost surely, 2^77978441 is an apocalyptic number.

It is an amenable number.

77978441 is a deficient number, since it is larger than the sum of its proper divisors (3496759).

77978441 is a wasteful number, since it uses less digits than its factorization.

77978441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4455.

The product of its digits is 395136, while the sum is 47.

The square root of 77978441 is about 8830.5402439488. The cubic root of 77978441 is about 427.2264994790.

The spelling of 77978441 in words is "seventy-seven million, nine hundred seventy-eight thousand, four hundred forty-one".