2978678407 has 4 divisors (see below), whose sum is σ = 3020631696. Its totient is φ = 2936725120.

The previous prime is 2978678371. The next prime is 2978678449. The reversal of 2978678407 is 7048768792.

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 2978678407 - 2²³ = 2970289799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2978678467) 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, 20976538 + ... + 20976679.

It is an arithmetic number, because the mean of its divisors is an integer number (755157924).

Almost surely, 2^2978678407 is an apocalyptic number.

2978678407 is a deficient number, since it is larger than the sum of its proper divisors (41953289).

2978678407 is an equidigital number, since it uses as much as digits as its factorization.

2978678407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41953288.

The product of its (nonzero) digits is 9483264, while the sum is 58.

The square root of 2978678407 is about 54577.2700581478. The cubic root of 2978678407 is about 1438.8246593468.

The spelling of 2978678407 in words is "two billion, nine hundred seventy-eight million, six hundred seventy-eight thousand, four hundred seven".