78253538 has 8 divisors (see below), whose sum is σ = 128051280. Its totient is φ = 35569780.

The previous prime is 78253537. The next prime is 78253547. The reversal of 78253538 is 83535287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78253538² = 12247232419034888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78253495 and 78253504.

It is not an unprimeable number, because it can be changed into a prime (78253537) 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, 1778468 + ... + 1778511.

It is an arithmetic number, because the mean of its divisors is an integer number (16006410).

Almost surely, 2^78253538 is an apocalyptic number.

78253538 is a deficient number, since it is larger than the sum of its proper divisors (49797742).

78253538 is a wasteful number, since it uses less digits than its factorization.

78253538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556992.

The product of its digits is 201600, while the sum is 41.

The square root of 78253538 is about 8846.1029838003. The cubic root of 78253538 is about 427.7283082215.

The spelling of 78253538 in words is "seventy-eight million, two hundred fifty-three thousand, five hundred thirty-eight".