78654031 has 4 divisors (see below), whose sum is σ = 80572464. Its totient is φ = 76735600.

The previous prime is 78653999. The next prime is 78654049. The reversal of 78654031 is 13045687.

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

It is not a de Polignac number, because 78654031 - 2⁵ = 78653999 is a prime.

It is a super-2 number, since 2×78654031² = 12372913185097922, 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 (78654131) 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, 959155 + ... + 959236.

It is an arithmetic number, because the mean of its divisors is an integer number (20143116).

Almost surely, 2^78654031 is an apocalyptic number.

78654031 is a deficient number, since it is larger than the sum of its proper divisors (1918433).

78654031 is a wasteful number, since it uses less digits than its factorization.

78654031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918432.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 78654031 is about 8868.7107856779. The cubic root of 78654031 is about 428.4567557377.

The spelling of 78654031 in words is "seventy-eight million, six hundred fifty-four thousand, thirty-one".