78477564 has 48 divisors (see below), whose sum is σ = 208454400. Its totient is φ = 22746240.

The previous prime is 78477563. The next prime is 78477583. The reversal of 78477564 is 46577487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78477563) 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, 9889 + ... + 15960.

It is an arithmetic number, because the mean of its divisors is an integer number (4342800).

Almost surely, 2^78477564 is an apocalyptic number.

It is an amenable number.

78477564 is an abundant number, since it is smaller than the sum of its proper divisors (129976836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78477564 is a wasteful number, since it uses less digits than its factorization.

78477564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25890 (or 25888 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 48.

The square root of 78477564 is about 8858.7563461244. The cubic root of 78477564 is about 428.1360894281.

The spelling of 78477564 in words is "seventy-eight million, four hundred seventy-seven thousand, five hundred sixty-four".