78553051 has 4 divisors (see below), whose sum is σ = 79659504. Its totient is φ = 77446600.

The previous prime is 78553021. The next prime is 78553063. The reversal of 78553051 is 15035587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15035587 = 7 ⋅2147941.

It is a cyclic number.

It is not a de Polignac number, because 78553051 - 2⁵ = 78553019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78552998 and 78553016.

It is not an unprimeable number, because it can be changed into a prime (78553001) 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, 553120 + ... + 553261.

It is an arithmetic number, because the mean of its divisors is an integer number (19914876).

Almost surely, 2^78553051 is an apocalyptic number.

78553051 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

78553051 is a deficient number, since it is larger than the sum of its proper divisors (1106453).

78553051 is a wasteful number, since it uses less digits than its factorization.

78553051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106452.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 78553051 is about 8863.0159088202. The cubic root of 78553051 is about 428.2733191045.

The spelling of 78553051 in words is "seventy-eight million, five hundred fifty-three thousand, fifty-one".