79778157 has 8 divisors (see below), whose sum is σ = 106776384. Its totient is φ = 52982688.

The previous prime is 79778143. The next prime is 79778177. The reversal of 79778157 is 75187797.

It is a happy number.

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

It is not a de Polignac number, because 79778157 - 2¹⁶ = 79712621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79778107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49768 + ... + 51345.

It is an arithmetic number, because the mean of its divisors is an integer number (13347048).

Almost surely, 2^79778157 is an apocalyptic number.

It is an amenable number.

79778157 is a deficient number, since it is larger than the sum of its proper divisors (26998227).

79778157 is a wasteful number, since it uses less digits than its factorization.

79778157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101379.

The product of its digits is 864360, while the sum is 51.

The square root of 79778157 is about 8931.8618999624. The cubic root of 79778157 is about 430.4882807360.

The spelling of 79778157 in words is "seventy-nine million, seven hundred seventy-eight thousand, one hundred fifty-seven".