78148738 has 8 divisors (see below), whose sum is σ = 117323388. Its totient is φ = 39040944.

The previous prime is 78148727. The next prime is 78148739. The reversal of 78148738 is 83784187.

It can be written as a sum of positive squares in 2 ways, for example, as 78092569 + 56169 = 8837^2 + 237^2 .

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

It is a super-2 number, since 2×78148738² = 12214450501985288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78148739) 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, 13681 + ... + 18532.

Almost surely, 2^78148738 is an apocalyptic number.

78148738 is a deficient number, since it is larger than the sum of its proper divisors (39174650).

78148738 is a wasteful number, since it uses less digits than its factorization.

78148738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33428.

The product of its digits is 301056, while the sum is 46.

The square root of 78148738 is about 8840.1774869060. The cubic root of 78148738 is about 427.5372797876.

The spelling of 78148738 in words is "seventy-eight million, one hundred forty-eight thousand, seven hundred thirty-eight".