672139278 has 24 divisors (see below), whose sum is σ = 1490170968. Its totient is φ = 218835792.

The previous prime is 672139267. The next prime is 672139289. The reversal of 672139278 is 872931276.

It is an interprime number because it is at equal distance from previous prime (672139267) and next prime (672139289).

It is a super-2 number, since 2×672139278² = 903542418060722568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 433425 + ... + 434972.

It is an arithmetic number, because the mean of its divisors is an integer number (62090457).

Almost surely, 2^672139278 is an apocalyptic number.

672139278 is an abundant number, since it is smaller than the sum of its proper divisors (818031690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

672139278 is a wasteful number, since it uses less digits than its factorization.

672139278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868448 (or 868445 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 672139278 is about 25925.6490371987. The cubic root of 672139278 is about 875.9643367604.

The spelling of 672139278 in words is "six hundred seventy-two million, one hundred thirty-nine thousand, two hundred seventy-eight".