78077552 has 20 divisors (see below), whose sum is σ = 172886256. Its totient is φ = 33461760.

The previous prime is 78077521. The next prime is 78077557. The reversal of 78077552 is 25577087.

It is a super-2 number, since 2×78077552² = 12192208252625408, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78077557) 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, 348449 + ... + 348672.

Almost surely, 2^78077552 is an apocalyptic number.

It is an amenable number.

78077552 is an abundant number, since it is smaller than the sum of its proper divisors (94808704).

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

78077552 is a wasteful number, since it uses less digits than its factorization.

78077552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697136 (or 697130 counting only the distinct ones).

The product of its (nonzero) digits is 137200, while the sum is 41.

The square root of 78077552 is about 8836.1502929726. The cubic root of 78077552 is about 427.4074252083.

The spelling of 78077552 in words is "seventy-eight million, seventy-seven thousand, five hundred fifty-two".