78980887 has 4 divisors (see below), whose sum is σ = 79355416. Its totient is φ = 78606360.

The previous prime is 78980879. The next prime is 78980893. The reversal of 78980887 is 78808987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78808987 = 101 ⋅780287.

It is a cyclic number.

It is not a de Polignac number, because 78980887 - 2³ = 78980879 is a prime.

It is a super-2 number, since 2×78980887² = 12475961022613538, 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 (78980807) 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, 186948 + ... + 187369.

It is an arithmetic number, because the mean of its divisors is an integer number (19838854).

Almost surely, 2^78980887 is an apocalyptic number.

78980887 is a deficient number, since it is larger than the sum of its proper divisors (374529).

78980887 is a wasteful number, since it uses less digits than its factorization.

78980887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374528.

The product of its (nonzero) digits is 1806336, while the sum is 55.

The square root of 78980887 is about 8887.1191620232. The cubic root of 78980887 is about 429.0494361846.

The spelling of 78980887 in words is "seventy-eight million, nine hundred eighty thousand, eight hundred eighty-seven".