78308534 has 4 divisors (see below), whose sum is σ = 117462804. Its totient is φ = 39154266.

The previous prime is 78308521. The next prime is 78308551. The reversal of 78308534 is 43580387.

It is a happy number.

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

It is a super-2 number, since 2×78308534² = 12264452994458312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19577132 + ... + 19577135.

It is an arithmetic number, because the mean of its divisors is an integer number (29365701).

Almost surely, 2^78308534 is an apocalyptic number.

78308534 is a deficient number, since it is larger than the sum of its proper divisors (39154270).

78308534 is a wasteful number, since it uses less digits than its factorization.

78308534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39154269.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 78308534 is about 8849.2109252746. The cubic root of 78308534 is about 427.8284861735.

The spelling of 78308534 in words is "seventy-eight million, three hundred eight thousand, five hundred thirty-four".