78461554 has 16 divisors (see below), whose sum is σ = 119567448. Its totient is φ = 38610432.

The previous prime is 78461531. The next prime is 78461557. The reversal of 78461554 is 45516487.

It can be written as a sum of positive squares in 4 ways, for example, as 77845329 + 616225 = 8823^2 + 785^2 .

It is not an unprimeable number, because it can be changed into a prime (78461557) 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, 37192 + ... + 39244.

Almost surely, 2^78461554 is an apocalyptic number.

78461554 is a deficient number, since it is larger than the sum of its proper divisors (41105894).

78461554 is a wasteful number, since it uses less digits than its factorization.

78461554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349.

The product of its digits is 134400, while the sum is 40.

The square root of 78461554 is about 8857.8526743224. The cubic root of 78461554 is about 428.1069731447.

The spelling of 78461554 in words is "seventy-eight million, four hundred sixty-one thousand, five hundred fifty-four".