78380989 has 4 divisors (see below), whose sum is σ = 80909440. Its totient is φ = 75852540.

The previous prime is 78380977. The next prime is 78381001. The reversal of 78380989 is 98908387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (78380977) and next prime (78381001).

It is a cyclic number.

It is not a de Polignac number, because 78380989 - 2¹¹ = 78378941 is a prime.

It is a super-2 number, since 2×78380989² = 12287158873236242, 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 (78380789) 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, 1264179 + ... + 1264240.

It is an arithmetic number, because the mean of its divisors is an integer number (20227360).

Almost surely, 2^78380989 is an apocalyptic number.

It is an amenable number.

78380989 is a deficient number, since it is larger than the sum of its proper divisors (2528451).

78380989 is a wasteful number, since it uses less digits than its factorization.

78380989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528450.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 78380989 is about 8853.3038465874. The cubic root of 78380989 is about 427.9603949873.

The spelling of 78380989 in words is "seventy-eight million, three hundred eighty thousand, nine hundred eighty-nine".