78380532 has 18 divisors (see below), whose sum is σ = 198128658. Its totient is φ = 26126832.

The previous prime is 78380513. The next prime is 78380539. The reversal of 78380532 is 23508387.

It can be written as a sum of positive squares in only one way, i.e., 54819216 + 23561316 = 7404^2 + 4854^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×78380532² = 12287015593206048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2177237 = 78380532 / (7 + 8 + 3 + 8 + 0 + 5 + 3 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78380539) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1088583 + ... + 1088654.

Almost surely, 2^78380532 is an apocalyptic number.

It is an amenable number.

78380532 is an abundant number, since it is smaller than the sum of its proper divisors (119748126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78380532 is a wasteful number, since it uses less digits than its factorization.

78380532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177247 (or 2177242 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 78380532 is about 8853.2780369759. The cubic root of 78380532 is about 427.9595632453.

The spelling of 78380532 in words is "seventy-eight million, three hundred eighty thousand, five hundred thirty-two".