78257532 has 24 divisors (see below), whose sum is σ = 183036672. Its totient is φ = 26023600.

The previous prime is 78257519. The next prime is 78257539. The reversal of 78257532 is 23575287.

It is a super-2 number, since 2×78257532² = 12248482629462048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78257539) 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, 2394 + ... + 12737.

It is an arithmetic number, because the mean of its divisors is an integer number (7626528).

Almost surely, 2^78257532 is an apocalyptic number.

It is an amenable number.

78257532 is an abundant number, since it is smaller than the sum of its proper divisors (104779140).

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

78257532 is a wasteful number, since it uses less digits than its factorization.

78257532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15569 (or 15567 counting only the distinct ones).

The product of its digits is 117600, while the sum is 39.

The square root of 78257532 is about 8846.3287300439. The cubic root of 78257532 is about 427.7355850717.

The spelling of 78257532 in words is "seventy-eight million, two hundred fifty-seven thousand, five hundred thirty-two".