78954551 has 16 divisors (see below), whose sum is σ = 88639488. Its totient is φ = 69832800.

The previous prime is 78954541. The next prime is 78954581. The reversal of 78954551 is 15545987.

It is a cyclic number.

It is not a de Polignac number, because 78954551 - 2⁶ = 78954487 is a prime.

It is a super-2 number, since 2×78954551² = 12467642247223202, 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 (78954521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42206 + ... + 44036.

It is an arithmetic number, because the mean of its divisors is an integer number (5539968).

Almost surely, 2^78954551 is an apocalyptic number.

78954551 is a deficient number, since it is larger than the sum of its proper divisors (9684937).

78954551 is a wasteful number, since it uses less digits than its factorization.

78954551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982.

The product of its digits is 252000, while the sum is 44.

The square root of 78954551 is about 8885.6373434886. The cubic root of 78954551 is about 429.0017423583.

The spelling of 78954551 in words is "seventy-eight million, nine hundred fifty-four thousand, five hundred fifty-one".