78338531 has 8 divisors (see below), whose sum is σ = 79125984. Its totient is φ = 77555200.

The previous prime is 78338527. The next prime is 78338543. The reversal of 78338531 is 13583387.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78338531 - 2² = 78338527 is a prime.

It is a super-2 number, since 2×78338531² = 12273850878475922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78328531) 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, 48131 + ... + 49731.

It is an arithmetic number, because the mean of its divisors is an integer number (9890748).

Almost surely, 2^78338531 is an apocalyptic number.

78338531 is a deficient number, since it is larger than the sum of its proper divisors (787453).

78338531 is a wasteful number, since it uses less digits than its factorization.

78338531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061.

The product of its digits is 60480, while the sum is 38.

The square root of 78338531 is about 8850.9056598746. The cubic root of 78338531 is about 427.8831074351.

The spelling of 78338531 in words is "seventy-eight million, three hundred thirty-eight thousand, five hundred thirty-one".