45278619 has 4 divisors (see below), whose sum is σ = 60371496. Its totient is φ = 30185744.

The previous prime is 45278609. The next prime is 45278621. The reversal of 45278619 is 91687254.

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

It is a cyclic number.

It is not a de Polignac number, because 45278619 - 2¹⁶ = 45213083 is a prime.

It is a super-2 number, since 2×45278619² = 4100306677094322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (45278609) 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, 7546434 + ... + 7546439.

It is an arithmetic number, because the mean of its divisors is an integer number (15092874).

Almost surely, 2^45278619 is an apocalyptic number.

45278619 is a deficient number, since it is larger than the sum of its proper divisors (15092877).

45278619 is a wasteful number, since it uses less digits than its factorization.

45278619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15092876.

The product of its digits is 120960, while the sum is 42.

The square root of 45278619 is about 6728.9389208106. The cubic root of 45278619 is about 356.4219080452.

The spelling of 45278619 in words is "forty-five million, two hundred seventy-eight thousand, six hundred nineteen".