78401933 has 4 divisors (see below), whose sum is σ = 78693660. Its totient is φ = 78110208.

The previous prime is 78401887. The next prime is 78401951. The reversal of 78401933 is 33910487.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9229444 + 69172489 = 3038^2 + 8317^2 .

It is a cyclic number.

It is not a de Polignac number, because 78401933 - 2¹⁰ = 78400909 is a prime.

It is a super-2 number, since 2×78401933² = 12293726196272978, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78401893 and 78401902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78401333) 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, 145460 + ... + 145997.

It is an arithmetic number, because the mean of its divisors is an integer number (19673415).

Almost surely, 2^78401933 is an apocalyptic number.

It is an amenable number.

78401933 is a deficient number, since it is larger than the sum of its proper divisors (291727).

78401933 is a wasteful number, since it uses less digits than its factorization.

78401933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291726.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 78401933 is about 8854.4866028472. The cubic root of 78401933 is about 427.9985096900.

The spelling of 78401933 in words is "seventy-eight million, four hundred one thousand, nine hundred thirty-three".