77969925 has 48 divisors (see below), whose sum is σ = 156269760. Its totient is φ = 37800000.

The previous prime is 77969923. The next prime is 77969933. The reversal of 77969925 is 52996977.

It is not a de Polignac number, because 77969925 - 2¹ = 77969923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77969921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2175 + ... + 12675.

It is an arithmetic number, because the mean of its divisors is an integer number (3255620).

Almost surely, 2^77969925 is an apocalyptic number.

77969925 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77969925 is an abundant number, since it is smaller than the sum of its proper divisors (78299835).

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

77969925 is a wasteful number, since it uses less digits than its factorization.

77969925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10531 (or 10520 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 54.

The square root of 77969925 is about 8830.0580405793. The cubic root of 77969925 is about 427.2109464907.

The spelling of 77969925 in words is "seventy-seven million, nine hundred sixty-nine thousand, nine hundred twenty-five".