26978157 has 32 divisors (see below), whose sum is σ = 43084800. Its totient is φ = 16628976.

The previous prime is 26978131. The next prime is 26978191. The reversal of 26978157 is 75187962.

It is a de Polignac number, because none of the positive numbers 2^k-26978157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26978117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21448 + ... + 22670.

It is an arithmetic number, because the mean of its divisors is an integer number (1346400).

Almost surely, 2^26978157 is an apocalyptic number.

26978157 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

26978157 is a deficient number, since it is larger than the sum of its proper divisors (16106643).

26978157 is a wasteful number, since it uses less digits than its factorization.

26978157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1288 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 26978157 is about 5194.0501537817. The cubic root of 26978157 is about 299.9190781742.

The spelling of 26978157 in words is "twenty-six million, nine hundred seventy-eight thousand, one hundred fifty-seven".