83978215 has 8 divisors (see below), whose sum is σ = 106701840. Its totient is φ = 63230592.

The previous prime is 83978203. The next prime is 83978227. The reversal of 83978215 is 51287938.

It is an interprime number because it is at equal distance from previous prime (83978203) and next prime (83978227).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83978215 - 2⁷ = 83978087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493905 + ... + 494074.

It is an arithmetic number, because the mean of its divisors is an integer number (13337730).

Almost surely, 2^83978215 is an apocalyptic number.

83978215 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

83978215 is a deficient number, since it is larger than the sum of its proper divisors (22723625).

83978215 is a wasteful number, since it uses less digits than its factorization.

83978215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988001.

The product of its digits is 120960, while the sum is 43.

The square root of 83978215 is about 9163.9628436610. The cubic root of 83978215 is about 437.9140504676.

The spelling of 83978215 in words is "eighty-three million, nine hundred seventy-eight thousand, two hundred fifteen".