78348554 has 4 divisors (see below), whose sum is σ = 117522834. Its totient is φ = 39174276.

The previous prime is 78348547. The next prime is 78348559. The reversal of 78348554 is 45584387.

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

It can be written as a sum of positive squares in only one way, i.e., 52896529 + 25452025 = 7273^2 + 5045^2 .

It is a super-2 number, since 2×78348554² = 12276991827781832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78348559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19587137 + ... + 19587140.

Almost surely, 2^78348554 is an apocalyptic number.

78348554 is a deficient number, since it is larger than the sum of its proper divisors (39174280).

78348554 is a wasteful number, since it uses less digits than its factorization.

78348554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39174279.

The product of its digits is 537600, while the sum is 44.

The square root of 78348554 is about 8851.4718550081. The cubic root of 78348554 is about 427.9013551158.

The spelling of 78348554 in words is "seventy-eight million, three hundred forty-eight thousand, five hundred fifty-four".