78398253 has 8 divisors (see below), whose sum is σ = 116145600. Its totient is φ = 52265484.

The previous prime is 78398251. The next prime is 78398263. The reversal of 78398253 is 35289387.

78398253 is a `hidden beast` number, since 7 + 8 + 398 + 253 = 666.

It is not a de Polignac number, because 78398253 - 2¹ = 78398251 is a prime.

It is a super-2 number, since 2×78398253² = 12292572146904018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78398199 and 78398208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78398251) 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, 1451793 + ... + 1451846.

It is an arithmetic number, because the mean of its divisors is an integer number (14518200).

Almost surely, 2^78398253 is an apocalyptic number.

It is an amenable number.

78398253 is a deficient number, since it is larger than the sum of its proper divisors (37747347).

78398253 is a wasteful number, since it uses less digits than its factorization.

78398253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903648 (or 2903642 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 78398253 is about 8854.2787961527. The cubic root of 78398253 is about 427.9918131750.

The spelling of 78398253 in words is "seventy-eight million, three hundred ninety-eight thousand, two hundred fifty-three".