77423780 has 48 divisors (see below), whose sum is σ = 196753536. Its totient is φ = 24983040.

The previous prime is 77423777. The next prime is 77423783. The reversal of 77423780 is 8732477.

It is an interprime number because it is at equal distance from previous prime (77423777) and next prime (77423783).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (77423783) 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, 13886 + ... + 18645.

It is an arithmetic number, because the mean of its divisors is an integer number (4099032).

Almost surely, 2^77423780 is an apocalyptic number.

77423780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77423780 is an abundant number, since it is smaller than the sum of its proper divisors (119329756).

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

77423780 is a wasteful number, since it uses less digits than its factorization.

77423780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32564 (or 32562 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 77423780 is about 8799.0783608285. The cubic root of 77423780 is about 426.2111335580.

The spelling of 77423780 in words is "seventy-seven million, four hundred twenty-three thousand, seven hundred eighty".