27961900 has 18 divisors (see below), whose sum is σ = 60677540. Its totient is φ = 11184720.

The previous prime is 27961891. The next prime is 27961909. The reversal of 27961900 is 916972.

It is an interprime number because it is at equal distance from previous prime (27961891) and next prime (27961909).

It is a super-2 number, since 2×27961900² = 1563735703220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27961909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139710 + ... + 139909.

Almost surely, 2^27961900 is an apocalyptic number.

27961900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27961900 is an abundant number, since it is smaller than the sum of its proper divisors (32715640).

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

27961900 is a wasteful number, since it uses less digits than its factorization.

27961900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279633 (or 279626 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 27961900 is about 5287.9012850090. The cubic root of 27961900 is about 303.5211036697.

The spelling of 27961900 in words is "twenty-seven million, nine hundred sixty-one thousand, nine hundred".