78383957 has 4 divisors (see below), whose sum is σ = 82994796. Its totient is φ = 73773120.

The previous prime is 78383951. The next prime is 78383959. The reversal of 78383957 is 75938387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57168721 + 21215236 = 7561^2 + 4606^2 .

It is a cyclic number.

It is not a de Polignac number, because 78383957 - 2²⁶ = 11275093 is a prime.

It is a super-2 number, since 2×78383957² = 12288089429955698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78383951) 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, 2305394 + ... + 2305427.

It is an arithmetic number, because the mean of its divisors is an integer number (20748699).

Almost surely, 2^78383957 is an apocalyptic number.

It is an amenable number.

78383957 is a deficient number, since it is larger than the sum of its proper divisors (4610839).

78383957 is a wasteful number, since it uses less digits than its factorization.

78383957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4610838.

The product of its digits is 1270080, while the sum is 50.

The square root of 78383957 is about 8853.4714660409. The cubic root of 78383957 is about 427.9657966815.

The spelling of 78383957 in words is "seventy-eight million, three hundred eighty-three thousand, nine hundred fifty-seven".