78153402 has 24 divisors (see below), whose sum is σ = 163404864. Its totient is φ = 24917464.

The previous prime is 78153373. The next prime is 78153407. The reversal of 78153402 is 20435187.

It is a super-2 number, since 2×78153402² = 12215908488347208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78153402.

It is not an unprimeable number, because it can be changed into a prime (78153407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9138 + ... + 15485.

It is an arithmetic number, because the mean of its divisors is an integer number (6808536).

Almost surely, 2^78153402 is an apocalyptic number.

78153402 is an abundant number, since it is smaller than the sum of its proper divisors (85251462).

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

78153402 is a wasteful number, since it uses less digits than its factorization.

78153402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24674 (or 24651 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 78153402 is about 8840.4412785788. The cubic root of 78153402 is about 427.5457849120.

Adding to 78153402 its reverse (20435187), we get a palindrome (98588589).

The spelling of 78153402 in words is "seventy-eight million, one hundred fifty-three thousand, four hundred two".