78077663 has 4 divisors (see below), whose sum is σ = 81472368. Its totient is φ = 74682960.

The previous prime is 78077641. The next prime is 78077683. The reversal of 78077663 is 36677087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36677087 = 19 ⋅1930373.

It is a cyclic number.

It is not a de Polignac number, because 78077663 - 2¹⁶ = 78012127 is a prime.

It is a super-2 number, since 2×78077663² = 12192242919083138, 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 (78077603) 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, 1697318 + ... + 1697363.

It is an arithmetic number, because the mean of its divisors is an integer number (20368092).

Almost surely, 2^78077663 is an apocalyptic number.

78077663 is a deficient number, since it is larger than the sum of its proper divisors (3394705).

78077663 is a wasteful number, since it uses less digits than its factorization.

78077663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394704.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 78077663 is about 8836.1565739862. The cubic root of 78077663 is about 427.4076277513.

The spelling of 78077663 in words is "seventy-eight million, seventy-seven thousand, six hundred sixty-three".