102778425 has 36 divisors (see below), whose sum is σ = 188023680. Its totient is φ = 53643360.

The previous prime is 102778411. The next prime is 102778439. The reversal of 102778425 is 524877201.

It is an interprime number because it is at equal distance from previous prime (102778411) and next prime (102778439).

It is not a de Polignac number, because 102778425 - 2⁷ = 102778297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102778425.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5716 + ... + 15434.

It is an arithmetic number, because the mean of its divisors is an integer number (5222880).

Almost surely, 2^102778425 is an apocalyptic number.

102778425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

102778425 is a deficient number, since it is larger than the sum of its proper divisors (85245255).

102778425 is a wasteful number, since it uses less digits than its factorization.

102778425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9782 (or 9774 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 102778425 is about 10137.9694712501. The cubic root of 102778425 is about 468.4184428710.

The spelling of 102778425 in words is "one hundred two million, seven hundred seventy-eight thousand, four hundred twenty-five".