612538078 has 4 divisors (see below), whose sum is σ = 918807120. Its totient is φ = 306269038.

The previous prime is 612538063. The next prime is 612538079. The reversal of 612538078 is 870835216.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 612538078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612538079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153134518 + ... + 153134521.

It is an arithmetic number, because the mean of its divisors is an integer number (229701780).

Almost surely, 2^612538078 is an apocalyptic number.

612538078 is a deficient number, since it is larger than the sum of its proper divisors (306269042).

612538078 is a wasteful number, since it uses less digits than its factorization.

612538078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306269041.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 612538078 is about 24749.5066213450. The cubic root of 612538078 is about 849.2672245194.

The spelling of 612538078 in words is "six hundred twelve million, five hundred thirty-eight thousand, seventy-eight".